A
[Ang80] Dana Angluin. On Counting Problems and the Polynomial Hierarchy. Theoretical Computer Science 12:161-173. Elsevier, 1980.
@article{tcs12()-Ang,
  author =              {Angluin, Dana},
  title =               {On Counting Problems and the Polynomial Hierarchy},
  publisher =           {Elsevier},
  journal =             {Theoretical Computer Science},
  volume =              {12},
  pages =               {161-173},
  year =                {1980},
}
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