http://www.johnrausch.com/DesignCompetition/2011/, 2011 , http://mechanical-puzzles.blogspot.co.il/2011/08/2011-puzzle-design-competition-part-2.htmlсборник

Статьи, опубликованные в сборнике

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• • 2011 Diamond in the Frame
  • Grebnev Kirill, Kanel-Belov Alexei
  • в сборнике http://www.johnrausch.com/DesignCompetition/2011/, 2011 , http://mechanical-puzzles.blogspot.co.il/2011/08/2011-puzzle-design-competition-part-2.html