3255 2006 2006 eng 21 26 conferenceobject 0 -- -- -- Rapid Mathematical Programming or How to Solve Sudoku Puzzles in a few Seconds Operations Research Proceedings 2005 http://opus.kobv.de/zib/volltexte/2005/884/ urn:nbn:de:0297-zib-8845 Thorsten Koch Hans-Dietrich Haasis Herbert Kopfer Jörn Schönberger Koch, Thorsten