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[[Shura-Bura's Program|Shura-Bura's chess playing program]], presumably for the [[M-20]], was developed in 1961 by a team headed by Shura-Bura <ref>В. Туманов ('''1961'''). ''Лучший ход» — за 58 секунд''. Таль—Ботвинник: матч-реванш на первенство мира. Бюллетень Центрального шахматно<br/>V. Tomanov Tumanov ('''1961'''). ''The best move in 58 seconds''. in the 8th Bulletin of the [https://en.wikipedia.org/wiki/World_Chess_Championship_1961 Botvinnik Tal 1961 revenge-match] (Russian)</ref> <ref>[[Jaap van den Herik]] ('''1983'''). ''Computerschaak, Schaakwereld en Kunstmatige Intelligentie''. Ph.D. thesis, [[Delft University of Technology]]. Academic Service, The Hague. ISBN 90 62 33 093 2 (Dutch), 2.2.9. Sjoera-Boera - translation from Russian by J.P. Warris, Russian teacher at TH Delft</ref> <ref>[http://www.schachcomputer.at/gesch6.htm Schachcomputer - Geschichte - 6] by [[Karsten Bauermeister]] (German)</ref> <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=70939&start=5 Re: The mystery of Alex Bernstein] by [[Sergei Markoff|Sergei S. Markoff]], [[CCC]], June 08, 2019 » [[Alex Bernstein]]</ref>.