Scientist at CERN report that the LHCb experiment has observed a four-charmtetraquark particle never seen before, which is likely to be the first of a previously undiscovered class of particles.[4][5][6]
Scientists report that they measured that quantum vacuum fluctuations can influence the motion of macroscopic, human-scale objects for the first time by measuring correlations below the standard quantum limit between the position/momentum uncertainty of the mirrors of LIGO and the photon number/phase uncertainty of light that they reflect.[7][8][9]
2 July – Scientists report that a more infectious SARS-CoV-2 variant with spike protein variant G614 has replaced D614 as the dominant form in the pandemic.[10][11]
Scientists show that adding an organic-based ionic solid into perovskites can result in substantial improvement in solar cell performance and stability. The study also reveals a complex degradation route that is responsible for failures in aged perovskite solar cells. The understanding could help the future development of photovoltaic technologies with industrially relevant longevity.[15][16]
The Versatile Video Coding standard (H.266) is finalised, designed to halve the bitrate of previous formats, and paving the way for on-demand 8K streaming services.[22][23]
Scientists report that analysis of simulations and a recent observational field model show that maximum rates of directional change of Earth's magnetic field reached ~10° per year – almost 100 times faster than current changes and ~10 times faster than previously thought.[24][25]
Scientists writing in the journal Brain publish evidence that a few mildly affected or recovering COVID-19 patients can be left with serious or potentially fatal brain conditions, such as delirium, inflammation, nerve damage, and psychosis.[29][30]
The World Meteorological Organisation (WMO) announces that it assesses a 20% chance that global warming compared to pre-industrial levels will exceed 1.5 °C in at least one year within the five years of 2020–2024. 1.5 °C is often considered to be a key threshold of global warming and nations have agreed to attempt limiting contemporary climate change to it under the Paris Agreement.[33][34]
Scientist report the development of a mobile robot chemist and demonstrate that it can assist in experimental searches. According to the scientists their strategy was automating the researcher rather than the instruments – freeing up time for the human researchers to think creatively – and could identify photocatalyst mixtures for hydrogen production from water that were six times more active than initial formulations.[38][39]
9 July – The World Health Organization (WHO) formally recognises that COVID-19 can be transmitted indoors by droplets in the air. People in crowded settings with poor ventilation run the risk of being infected, according to the updated scientific advice.[40][41]
10 July: Scientists report that the Moon formed slightly later than thought (4.425 ±0.025 bya) and that it hosted an ocean of magma for much longer than previously thought (~200 My).[42] Image: the thermal state of the Moon at age 100 My (from the study)
Scientists report that the Moon formed about 85 million years later than thought (4.425 ±0.025 bya) and that it hosted an ocean of magma for longer than previously thought (~200 million years).[42][49][50]
13 July – Researchers report the development of a reusable aluminium surface for efficient solar-based water sanitation to below the WHO and EPA standards for drinkable water.[51][52]
15 July: In two studies of the Global Carbon Project researchers summarise and analyse new estimates of the global methane budget and provide data and insights on sources and sinks for the geographical regions and economic sectors where the rising anthropogenic methane emissions have changed the most over recent decades.[55]
15 July
Researchers report the discovery of chemolithoautotrophic bacterial culture that feeds on the metal manganese after performing unrelated experiments and named its bacterial species Candidatus Manganitrophus noduliformans and Ramlibacter lithotrophicus.[56][57][58]
In two studies researchers of the Global Carbon Project summarise and analyse new estimates of the global methane budget and provide data and insights on sources and sinks for the geographical regions and economic sectors where the rising anthropogenic methane emissions have changed the most over recent decades. According to the studies, global methane emissions for the 2008 to 2017 decade increased by almost 10 percent compared to the previous decade.[59][55][60][61]
16 July: Scientists, using public biological data on 1.75 m people with known lifespans overall, identify 10 genomic loci which appear to intrinsically influence healthspan, lifespan, and longevity and identify haem metabolism as a promising candidate for further research within the field.[62]
16 July – Scientists report to have identified 10 genomic loci which appear to intrinsically influencehealthspan, lifespan, and longevity – of which half have not been reported previously at genome-wide significance and most being associated with cardiovascular disease – as well as haem metabolism as a promising candidate for further research within the field. Their study using public biological data on 1.75 m people with known lifespans overall, suggests that haem metabolism may play a role in human ageing and that high levels of iron in the blood likely reduce, and genes involved in metabolising iron likely increase healthy years of life in humans.[62][63]
17 July – Scientists report that yeast cells of the same genetic material and within the same environment age in two distinct ways, describe a biomolecular mechanism that can determine which process dominates during aging and genetically engineer a novel aging route with substantially extended lifespan.[64][65]
19 July
The Emirates Mars Mission by the UAE is successfully launched, carrying the Hope probe to Mars, with a scheduled arrival date of February 2021.[1]
Archaeologists report the earliest known evidence of humans in the Americas, dating back 33,000 years, twice the previously oldest known settlement of the continent.[71][72]
Scientists report results of a survey of 371 reefs in 58 nations estimating the conservation status of reef sharks globally. No sharks have been observed on almost 20% of the surveyed reefs and shark depletion was strongly associated with both socio-economic conditions and conservation measures.[76][77] Sharks are considered to be a vital part of the ocean ecosystem.
A paper on a "hummingbird-sized dinosaur" conserved in amber published on March 11th is retracted after reviewers agreed with assessments – of which one was uploaded to a preprint server on March 18 – claiming a misclassification of the fossil, believed to be a lizard instead of a dinosaur.[78][79]
23 July
China successfully launches Tianwen-1, its first rover mission to Mars, with a planned surface landing date of 23 April 2021.[2]
27 July – A new AI algorithm by the University of Pittsburgh achieves the highest accuracy to date in identifyingprostate cancer, with 98% sensitivity and 97% specificity.[87][88]
Scientists of the NA62 experiment at CERN claim to have presented first evidence of a highly rare process – a decay of a charged kaon – predicted in the Standard Model which may help identifying possible deviations from the model.[93]
Scientists report that they have transformed the abundant diamagnetic material known as "fool's gold" and pyrite into a ferromagnetic one by inducing voltage, which may lead to techniques with potential applications for devices such as magnetic data storage ones.[94][95]
Scientists report that work honored by Nobel prizes clusters in only a few scientific fields with only 36/71 having received at least one Nobel prize of the 114/849 domains science could be divided into according to their DC2 and DC3 classification systems. Five of the 114 domains were shown to make up over half of the Nobel prizes awarded 1995–2017 (particle physics [14%], cell biology [12.1%], atomic physics [10.9%], neuroscience [10.1%], molecular chemistry [5.3%]).[92][96]
Scientists report that geochemical data shows that the origin of 50 of the 52 sarsen megaliths used to construct Stonehenge is most likely West Woods, Wiltshire, 25 km north of Stonehenge.[97][98]
30 July – NASA successfully launches its Mars 2020 rover mission to search for signs of ancient life and collect samples for return to Earth. The mission includes technology demonstrations to prepare for future human missions.[3]
31 July
Two ice caps in Nunavut, Canada have disappeared completely, confirming predictions of a study published in 2017 that they would melt completely within five years.[99]
1 August: Brazil's NISR reports that satellite data shows that the number of fires in the Amazon increased by 28% to ~6,800 fires in July compared to the ~5,300 wildfires in July 2019.[102] (Image acquired by MODIS on NASA's Aqua satellite on August 1, 2020.)[103]
2 August – Scientists report a newly discovered vulnerability in SARS-CoV-2's spike protein – a positively charged cleavage site near its binding site, which they demonstrate could be exploited by negatively charged molecule that bind to it and thereby inhibit the virus from bonding strongly to the host cell.[106][107][108]
3 August – Scientists report that valley networks in the southern highlands of Mars may have been formed mostly under glaciers, not free-flowing rivers of water, indicating that early Mars was colder than thought and that extensive glaciation likely occurred in its past.[109][110][111]
4 August
Physicists working on the ATLAS and CMS experiments at the Large Hadron Collider announce new results indicating that the Higgs boson decays into two muons as expected.[112]
Astronomers report that self-annihilating dark matter (DM) is not the explanation for the Galactic Center GeV excess (GCE) in the center of the Milky Way galaxy after all, stating: "there is no significant excess in the [GCE] that may be attributed to DM annihilation".[113][114]
New Guinea is determined to be the world's most floristically diverse island with well over 13,000 confirmed species of vascular plants recorded thus far, surpassing that of Madagascar.[117][118]5 August: The flora of New Guinea - long known the "Last Botanical Frontier" - is thoroughly cataloged by researchers for the first time. Bulbophyllum is the most diverse plant genus in New Guinea with 658 native species, 91% of them endemic.[118]
6 August
The Canadian Ice Service reports that the Milne Ice Shelf, the last fully intact ice shelf in the Canadian Arctic, has collapsed after losing more than 40% of its area in just two days.[119][120]
Scientists report the creation of the brightest fluorescent solid optical materials so far by enabling the transfer of properties of highly fluorescent dyes via spatial and electronic isolation of the dyes by mixing cationic dyes with anion-binding cyanostarmacrocycles. According to a co-author these materials may have applications in areas such as solar energy harvesting, bioimaging, and lasers.[121][122][123][124]
Scientists present an extension to an algorithm to infer local genetic relationships published in October 2019 and report that 3% of the Neanderthal genome was introgressed from ancient humans ~200-300kya and predict that 1% of the Denisovan genome was introgressed from an unknown highly diverged, archaic hominin ancestor of which 15% were introgressed into modern humans alive today.[125][126]
Scientists report the discovery of the oldest monkey fossils outside of Africa; particularly, of Mesopithecus pentelicus, about 6.4 million years old, in Yuhane Province, China.[127]
7 August
A study concludes that the direct effect of the response to the pandemic on global warming will likely be negligible, with an estimated cooling of around 0.01 ±0.005 °C by 2030 and that a well-designed economic recovery could avoid future warming of 0.3 °C by 2050. The study indicates that systemic change for "decarbonization" of humanity's economic structures is required for a substantial impact on global warming.[128][129]
Russia's Roscosmos chief Dmitry Rogozin announces that he wishes for the agency to explore Venus and to bring back surface materials and that they are building a reusable rocket.[130][131] On 15 September he told reporters that "projects of Venus missions are included in the united government program of Russia’s space exploration for 2021-2030" and that they includeVenera-D.[132]
8 August – NASA announces it will change unofficial and potentially contentious names used by the scientific community for distant cosmic objects and systems including references to NGC 2392 as "the Eskimo Nebula" and NGC 4567 and NGC 4568 as the "Siamese Twins Galaxy".[133]
Scientists report that bi-directional connections, or added appropriate feedback connections, can accelerate and improve communication between and in modular neuralnetworks of the brain's cerebral cortex and lower the threshold for their successful communication.[136][137]
11 August
COVID-19 pandemic: Russia's President Vladimir Putin announces that Russia commits the first approval of a COVID-19 vaccine "Gam-COVID-Vac". This is a controversial step due to widely perceived lack of sufficient testing of the vaccine.[138] In November high efficacy in phase III interim results was reported.[139]
Astronomers announce the discovery of S4714, a star orbiting the black hole at the center of the Milky Way at up to 8% the speed of light.[140][141]
12 August
The latest State of the Climate report finds that 2010 to 2019 was the hottest decade on record globally, with an increase of 0.39 °C (0.7 °F) above the long-term average, and 2019 either the second or third warmest year on record.[142][143]
13 August: Melting of the Greenland ice sheet is shown to have passed the point of no return, based on 40 years of satellite data. The switch to a dynamic state of sustained mass loss resulted from widespread retreat in 2000–2005.[147]
Unexpected dimming of Betelgeuse is explained by NASA as a "traumatic outburst", caused by an immense amount of hot material ejected into space, forming a dust cloud that blocked starlight.[150][151][152] On 30 August 2020, astronomers reported the detection of a second dust cloud emitted from Betelgeuse, and associated with a secondary minimum on 3 August in luminosity of the star.[153]
Universal coherence protection is reported to have been achieved in a solid-state spin qubit, a modification that allows quantum systems to stay operational (or "coherent") for 10,000 times longer than before.[154][155]
Melting of the Greenland ice sheet is shown to have passed the point of no return, based on 40 years of satellite data, by scientists at Ohio State University. The switch to a dynamic state of sustained mass loss resulted from widespread retreat in 2000–2005.[147][157][158]
14 August – Scientists report the discovery of the oldest grass bedding from at least 200,000 years ago, much older than the oldest previously known bedding. They speculate that insect-repellent plants and ash layers, sometimes due to burned older grass beddings, found beneath the bedding have been used for a dirt-free, insulated base and to keep away arthropods.[159][160][161]
Astronomers report that the interstellar objectʻOumuamua (1I/2017 U1) is not likely to be composed of frozen hydrogen which had been proposed earlier. The compositional nature of the object continues to be unknown.[164][165] Nonetheless, the possibility that the interstellar object may be alien technology has not been ruled out, although such an explanation is reported to be a "long shot" by "most scientists".[166]
Scientists report the achievement of a milestone in the development of laser-plasma accelerators and demonstrate their longest stable operation of 30 hours. These particle accelerators are far smaller than conventional ones, may have technological applications and may provide a way to energies beyond the LHC.[172][173][174][175][176]
19 August
An analysis indicates that sustainableseafood could increase by 36–74% by 2050 compared to current yields and that whether or not these production potentials are realized sustainably depends on factors such as policy reforms, technological innovation and the extent of future shifts in demand.[177][178]
Researchers report that widespread declines in Pacific salmon size resulted in substantial losses to ecosystems and people, which they estimate, and are associated with factors that include climate change and competition with growing numbers of wild and hatchery salmon.[179][180]
Researchers provide explanations for variations in the rate of global mean sea-level rise since 1900 and report that dam building in the 20th century offset factors that would have led to a higher rate during the 1970s, implying that no additional processes are required to explain the observed major variations.[181][182][183]
20 August – Scientists report that the Greenland ice sheetlost a record amount of 532 billion metric tons of ice during 2019, surpassing the old record of 464 billion metric tons in 2012 and returning to high melt rates, and provide explanations for the reduced ice loss in 2017 and 2018.[184][185]
A study finds that almost 300 million people live on tropical forest restoration opportunity land in the Global South, constituting a large share of low-income countries' populations, and argues for prioritized inclusion of "local communities" in forest restoration projects.[189][190][191]
Researchers assess potential global soil erosion rates by water due to projected climate- and land use-change for multiple SSP-RCP scenarios, indicating that global soil erosion by water may increase 30-66% between 2015 and 2070 and that the greatest increases will occur in areas with tropical climates, which could inform strategies for soil conservation.[192][193][194]
Scientists report that ionizing radiation from environmental radioactive materials and cosmic rays may substantially limit the coherence times of qubits if they aren't shielded adequately.[201][202][203]
Scientists report that the average global temperature of the last ice age, or Last Glacial Maximum, was ~6.1 °C cooler than today and that the equilibrium climate sensitivity was 3.4 °C, consistent with the established consensus range of 2–4.5 °C.[204][205]
Scientists describe a way cells – in particular cells of a slime mold and mouse pancreatic cancer–derived cells – are able to navigate efficiently through a body and identify the best routes through complex mazes: generating gradients after breaking down diffused chemoattractants which enable them to sense upcoming maze junctions before reaching them, including around corners.[214][215][216]
Quantum engineers working for Google report the largest chemical simulation on a quantum computer – a Hartree–Fock approximation with Sycamore paired with a classical computer that analyzed results to provide new parameters for the 12-qubit system.[217][218][219]
14 September: Scientists announce the detection of phosphine in Venus' atmosphere, which is known to be a strong predictor for the presence of microbial life.[227] (This image is the first received photo sent from the surface of another planet, Venus).[228]
1 September
A new infrared spectroscopy method capable of 80 million spectra per second, nearly 100 times faster than previous techniques, is reported.[229][230]
A study supports the theory, formalised in 2019,[231] that generic objects of dark energy (GEODEs) formed by stellar collapse of very large, early stars could be the sources of dark energy and are spread throughout the intergalactic medium.[232][233]
After visualizing droplet dispersal for face shields and masks with exhalation valves scientists report that these two types of face coverings can be ineffective against COVID-19 spread and recommend alternatives to minimize viral spread.[234][235]
Researchers report that mining for renewable energy production will increase threats to biodiversity and publish a map of areas that contain needed materials as well as estimations of their overlaps with "Key Biodiversity Areas", "Remaining Wilderness" and "Protected Areas". The authors assess that careful strategic planning is needed.[236][237][238]
Researchers in China demonstrate how microplastic pollution contaminates the soil and harms the abundance of common species, such as microarthropods and nematodes, as well as disrupting carbon and nutrient cycling.[241][242]
Researchers present an eight-user city-scale quantum communication network using already deployed fibres without active switching or trusted nodes.[243][244]
Scientists report that asphalt currently is a significant and largely overlooked source of air pollution in urban areas, especially during hot and sunny periods.[245][246]
3 September
A study highlights the importance of old bulls in African savannah elephants and, according to the study, raises concerns over the removal of old bulls as currently occurring in both legal trophy hunting and illegal poaching.[247][248]
Scientists announce new experimental evidence for the existence of anyons.[249][250]
Scientists report finding "176 Open Accessjournals that, through lack of comprehensive and open archives, vanished from the Web between 2000-2019, spanning all major research disciplines and geographic regions of the world" and that in 2019 only about a third of the 14,068 DOAJ-indexed journals ensured the long-term preservation of their content themselves, with many papers not getting archived by initiatives such as the Internet Archive.[251][252][253]
After investigating how mammalian extinction rates have changed over the past 126,000 years, scientists report that mainly (about 96% prediction accuracy) human population size and/or specific human activities, not climate change, cause global mammal extinctions and predict a near future "rate escalation of unprecedented magnitude".[258][259]
Scientists report the discovery of a nanobody from alpacas, Ty1, with the capacity to block SARS-CoV-2 from entering human cells in vitro due to targeting its receptor binding domain, blocking it from binding with ACE2.[260][261]
7 September
Scientists report that a low-frequency radio emissions SETI survey of the Vela region, known to include at least 10 million stars, did not discover any active signalling of extraterrestrial intelligence. It has been described as the deepest and broadest such search at low frequencies to date.[262][263]
A scientific review by German and Luxembourgian NGOs shows that electromagnetic radiation – such as mobile phone and Wi-Fi radiation – likely has a negative impact on, declining, insects, with 72 of 83 analyzed studies finding an effect.[264][265]
Researchers report the magnitudes of climate change mitigation effects of shifting global food production and consumption to plant-based diets which are mainly composed of foods that require only a small fraction of the land and CO2 emissions required for meat and dairy. They conclude that such changes could offset CO2 emissions equal to the past 9 to 16 years of fossil fuel emissions in nations, they grouped into 4 types, and provide a map of regional opportunities.[266][267]
8 September
Scientists in northern India report the discovery of the fossil molar tooth of a new extinct species, and oldest known ancestor of gibbons, named Kapi ramnagarensis, that lived about 13 million years ago. This reportedly closes a major gap in the hominoid fossil record and shows that gibbons migrated to Asia at least five million years earlier than thought previously.[268][269][270]
Scientists report the oldest Neanderthal specimen in Central-Eastern Europe, found in the Stajnia Cave. A ~80,000 years old tooth dated via mtDNA shows that at a time of environmental changes Neanderthals most related to those of Northern Caucasus moved farther from their southern home areas than previously known.[275][276]
The latest report of the Living Planet Index (LPI) finds that, based on more than 4,000 tracked vertebrate species' population sizes, vertebrates have declined by 68% between 1970 and 2016, with increasing deforestation and agricultural expansion being key drivers and the largest decline of 94% in the LPI occurring in the tropical subregions of the Americas.[284][285]
Analysis from NASA and NOAA confirms that solar cycle 25 has begun and confirms the start of the solar cycle to be December 2019, the time of a solar minimum. Solar cycle 24 lasted an average length of 11 years.[299][300]
A genetic analysis of more than 400 skeletons buried as Vikings provides a clearer picture of the Viking Age in Europe and Viking ancestry, showing i.a. that local people of Scotland were buried as Vikings and may have taken on Viking identities, that the contemporary United Kingdom's population has up to 6% Viking DNA and that "many Viking Age individuals — both within and outside Scandinavia — have high levels of non-Scandinavian ancestry".[304][305]
Researchers report the development of two active guide RNA-only elements that, according to their study, may enable halting or deleting gene drives introduced into populations in the wild with CRISPR-Cas9 gene editing. The paper's senior author cautions that the two neutralizing systems they demonstrated in cage trials "should not be used with a false sense of security for field-implemented gene drives".[311][312]
Media reports of what may be the first publicly confirmed case of a, civilian, fatality as a nearly direct consequence of a cyberattack, after ransomware disrupted a hospital in Germany.[313]
Scientists report the likely oldest securely dated evidence for Homo sapiens in the Arabian Peninsula – ~120,000 year-old footprints of two or three human individuals visiting a lake.[314][315][316]
22 September – Researchers report that over half of endangered species' proposed recovery plan budgets are allocated to research and monitoring (R&M), that species with higher proportions of such budgets have poorer recovery outcomes and provide recommendations for ensuring that "conservation programs emphasize action or [R&M] that directly informs action".[320][321]
Scientists publish new findings and data about the supermassive black holeM87*, including a video of the black hole based on data not sufficient for images, using statistical modeling about changes in its appearance in 2009–2017, showing variations of its orientation and a wobbling ring – constituting the "first glimpse of the dynamical structure of the accretion flow so close to the black hole's event horizon".[324][325]
24 September – Researchers report that 13.7% of blood samples from 987 individuals with severe COVID-19 contained "auto-antibodies" against the patients' own type I interferons.[326][327]
Scientists report that carrion crows show a neuronal response that correlates with their perception of a stimulus, which they argue to be an empirical marker of (avian/corvid) sensory consciousness – the conscious perception of sensory input – in the crows which do not have a cerebral cortex.[332][333] A related study, published on the same day, shows that the birds' pallium's neuroarchitecture is reminiscent of the mammalian cortex.[334][335]
Scientists report with a preprint that reanalysis of LMNSin-situ-based data of around 1980 supports the presence of phosphine on Venus, reported on 14 September. Their data-analysis found a phosphorus signal that fits to phosphine in data gathered with the probe the NASA spacecraft "Pioneer" dropped down to Venus to measure the chemistry of its clouds.[336][337]
28 September
Scientists confirm the existence of several large saltwater lakes under the ice in the south polar region of the planet Mars. According to one of the researchers, "We identified the same body of water [as suggested earlier in a preliminary initial detection], but we also found three other bodies of water around the main one ... It’s a complex system."[338][339]
Scientists warn that an "international effort is needed to manage a changing fire regime in the vulnerable Arctic", reporting that satellite data shows how the Arctic fire regime is changing.[340][341] On 3 September EU institutions reported that, according to satellite data, the Arctic fires already far surpassed the total of CO2 emissions for the 2019 season.[342]
Scientists report that they expect construction of the experimental SPARC experimental fusion reactor to begin in 2021 and take four years to complete, and, with seven studies, that it is "very likely" to work.[349][350]
^Miao, Kevin C.; Blanton, Joseph P.; Anderson, Christopher P.; Bourassa, Alexandre; Crook, Alexander L.; Wolfowicz, Gary; Abe, Hiroshi; Ohshima, Takeshi; Awschalom, David D. (12 May 2020). "Universal coherence protection in a solid-state spin qubit". Science. 369 (6510): 1493–1497. arXiv:2005.06082v1. Bibcode:2020Sci...369.1493M. doi:10.1126/science.abc5186. PMID32792463. S2CID218613907.
^Costello, Christopher; Cao, Ling; Gelcich, Stefan; Cisneros-Mata, Miguel Á; Free, Christopher M.; Froehlich, Halley E.; Golden, Christopher D.; Ishimura, Gakushi; Maier, Jason; Macadam-Somer, Ilan; Mangin, Tracey; Melnychuk, Michael C.; Miyahara, Masanori; de Moor, Carryn L.; Naylor, Rosamond; Nøstbakken, Linda; Ojea, Elena; O’Reilly, Erin; Parma, Ana M.; Plantinga, Andrew J.; Thilsted, Shakuntala H.; Lubchenco, Jane (19 August 2020). "The future of food from the sea". Nature. 588 (7836): 95–100. Bibcode:2020Natur.588...95C. doi:10.1038/s41586-020-2616-y. hdl:11093/1616. ISSN1476-4687. PMID32814903. S2CID221179212.
^Tally, Steve (4 September 2020). "New evidence that the quantum world is even stranger than we thought". Phys.org. One characteristic difference between fermions and bosons is how the particles act when they are looped, or braided, around each other. Fermions respond in one straightforward way, and bosons in another expected and straightforward way. Anyons respond as if they have a fractional charge, and even more interestingly, create a nontrivial phase change as they braid around one another. This can give the anyons a type of "memory" of their interaction.
^Laakso, Mikael; Matthias, Lisa; Jahn, Najko (2021). "Open is not forever: A study of vanished open access journals". Journal of the Association for Information Science and Technology. 72 (9): 1099–1112. arXiv:2008.11933. doi:10.1002/ASI.24460. S2CID221340749.
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