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[Kre88] Mark W. Krentel. The Complexity of Optimization Problems. Journal of Computer and System Sciences 36(3):490-509. Academic Press, juin 1988. 
@article{jcss36(3)-Kre,
  author =              {Krentel, Mark W.},
  title =               {The Complexity of Optimization Problems},
  publisher =           {Academic Press},
  journal =             {Journal of Computer and System Sciences},
  volume =              {36},
  number =              {3},
  pages =               {490-509},
  year =                {1988},
  month =               jun,
}
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