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* [http://jewishchesshistory.blogspot.de/2008/01/prime-ministers-and-retrograde-analysis.html Jewish Chess History: Prime Ministers and Retrograde Analysis]
* [http://joekisenwether.wordpress.com/non-chess-retrograde-analysis/ Non-Chess Retrograde Analysis] « [http://joekisenwether.wordpress.com/ Joe Kisenwether's Blog]
==Programs==
* [http://lestourtereaux.free.fr/euclide/ Euclide 1.11 - Home] by [[Étienne Dupuis]] » [[Euclide]]