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WikiPedia: Ferdinand von Lindemann http://cantic.bnc.cat/registres/CUCId/a10113265 http://data.rero.ch/02-A003522552 http://www.springerlink.com/content/n109018v5r7480... http://uli.nli.org.il/F/?func=direct&doc_number=00... http://data.bibliotheken.nl/id/thes/p102985693 http://www.genealogy.ams.org/html/id.phtml?id=7404 http://www-history.mcs.st-and.ac.uk/Biographies/Li... http://www-history.mcs.st-andrews.ac.uk/Biographie... https://nla.gov.au/anbd.aut-an35259189 https://trove.nla.gov.au/people/886051