Ana Cannas da Silva, Berkeley 1996
<bdi><a href="https://en.wikipedia.org/wiki/en:George_Bergman" class="extiw" title="w:en:George Bergman"><span title="American mathematician">George Bergman</span></a>
</bdi>
CC BY-SA 4.0
old: <a rel="nofollow" class="external free" href="https://opc.mfo.de/detail?photo_id=10339">https://opc.mfo.de/detail?photo_id=10339</a>; new: scanned via Epson Perfection V370