Image: Wagner and Harary

Description: Klaus Wagner and Frank Harary at Oberwolfach
Title: Wagner and Harary
Credit: https://opc.mfo.de/detail?photoID=4390
Author: Konrad Jacobs
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Usage Terms: Creative Commons Attribution-Share Alike 2.0 de
License: CC BY-SA 2.0 de
License Link: https://creativecommons.org/licenses/by-sa/2.0/de/deed.en
Attribution Required?: Yes