H
[HW97] Harald Hempel et Gerd Wechsung. The Operators min and max on the Polynomial Hierarchy. Technical Report TR97-025, Electronic Colloquium on Computational Complexity, mai 1997. 
@techreport{ECCC-TR97-025-HW,
  author =              {Hempel, Harald and Wechsung, Gerd},
  title =               {The Operators min and max on the Polynomial
                         Hierarchy},
  number =              {TR97-025},
  year =                {1997},
  month =               may,
  institution =         {Electronic Colloquium on Computational Complexity},
  type =                {Technical Report},
}
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