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Photograph of en:Leo Koenigsberger taken as part of the 500th anniversary celebration of the en:Ruprecht Karl University of Heidelberg in 1886.

• Source:http://www.ub.uni-heidelberg.de/helios/fachinfo/www/math/txt/koenigsberger/leben.htm

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• http://upload.wikimedia.org/wikipedia/en/4/4c/Leo Koenigsberg.jpg (05:00, 7 December 2005) . . User:Chick Bowen (Chick Bowen) (User talk:Chick Bowen (Talk) ) . . 268x326 (9447 bytes) (Photograph of [/w/index.php?title=Leo_Koenigsberg&action=edit" class="new Leo Koenigsberg] (Leo Koenigsberg) taken as part of the 500th anniversary celebration of the Ruprecht Karl University of Heidelberg (Ruprecht Karl University of Heidelberg) in 1886. *Source:http://www.ub.uni-heidelberg.de/helios/fachinfo/www/math/edd/koenigsberger/leben.htm )