J
[Jur98] Marcin Jurdziński. Deciding the Winner in Parity Games is in UP∩co-UP. Information Processing Letters 68(3):119-124. Elsevier, November 1998. 
@article{ipl68(3)-Jur,
  author =              {Jurdzi{\'n}ski, Marcin},
  title =               {Deciding the Winner in Parity Games is in
                         {UP}{\(\cap\)}co-{UP}},
  publisher =           {Elsevier},
  journal =             {Information Processing Letters},
  volume =              {68},
  number =              {3},
  pages =               {119-124},
  year =                {1998},
  month =               nov,
}
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