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WikiPedia: Niels Henrik Abel http://fermatslasttheorem.blogspot.com/2006/02/nie... http://www.abelprisen.no/en/abel/ http://www.snl.no/.nbl_biografi/Niels_Henrik_Abel/... http://www.genealogy.ams.org/html/id.phtml?id=5517... http://www-groups.dcs.st-and.ac.uk/~history/Biogra... http://www-history.mcs.st-andrews.ac.uk/Biographie... https://commons.wikimedia.org/wiki/Category:Niels_...