@inproceedings{Koch2006,
  author    = {Thorsten Koch},
  title     = {Rapid Mathematical Programming or How to Solve Sudoku Puzzles in a few Seconds},
  booktitle = {Operations Research Proceedings 2005},
  editor    = {Hans-Dietrich Haasis and Herbert Kopfer and J{\"o}rn Sch{\"o}nberger},
  pages     = {21 -- 26},
  url       = {http://opus.kobv.de/zib/volltexte/2005/884/},
  year      = {2006},
}