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* [http://www.playwitharena.com/?Newsticker:Archive_9 Interview with SOS programmer Rudolf Huber in German language!] by [[Frank Quisinsky]], [[Arena|Arena Chess GUI 3.0]] - Archive 9, 132, May 10, 2005
==Misc==
* [https://en.wiktionary.org/wiki/SOS SOS - Wiktionary]
* [https://en.wikipedia.org/wiki/SOS SOS from Wikipedia] (· · · — — — · · ·)