P
[Pap84] Christos H. Papadimitriou. On the Complexity of Unique Solutions. Journal of the ACM 31(2):392-400. ACM Press, April 1984. 
@article{jacm31(2)-Pap,
  author =              {Papadimitriou, {\relax Ch}ristos H.},
  title =               {On the Complexity of Unique Solutions},
  publisher =           {ACM Press},
  journal =             {Journal of the~ACM},
  volume =              {31},
  number =              {2},
  pages =               {392-400},
  year =                {1984},
  month =               apr,
}
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