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I put an unreferenced tag because there are no references about the subject. The "references" given are just noting books he authored. LogicalFinance33 (talk) 07:50, 9 February 2012 (UTC)[reply]
He has a page on the German Wikipedia [1]. Maybe someone can use that to expand this page and add some sources. LogicalFinance33 (talk) 07:53, 9 February 2012 (UTC)[reply]
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