K
[Kre87] Mark W. Krentel. The Complexity of Optimization Problems. PhD thesis, Department of Computer Science, Cornell University, Ithaca, New York, USA, 1987. 
@phdthesis{phd-krentel,
  author =              {Krentel, Mark W.},
  title =               {The Complexity of Optimization Problems},
  year =                {1987},
  school =              {Department of Computer Science, Cornell University,
                         Ithaca, New York, USA},
  type =                {{PhD} thesis},
}
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