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* [https://en.chessbase.com/post/ken-thompson-moscow-adventures-1 Ken Thompson: Moscow adventures (1)] by [[Frederic Friedel]], [[ChessBase|ChessBase News]], January 04, 2020 » [[Ken Thompson]], [[Mikhail Botvinnik]]
* [https://en.chessbase.com/post/ken-thompson-moscow-adventures-2 Ken Thompson: Moscow adventures (2)] by [[Frederic Friedel]], [[ChessBase|ChessBase News]], January 05, 2020
* [https://en.chessbase.com/post/east-german-programmers-in-budapest East German programmers in Budapest] by [[Frederic Friedel]], [[ChessBase|ChessBase News]], July 05, 2020 » [[WMCCC 1983]], [[Chess-Master]]
==Spiegel==
