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@article{Card_Equiv_Relations-AFP,
  author  = {Lukas Bulwahn},
  title   = {Cardinality of Equivalence Relations},
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  month   = may,
  year    = 2016,
  note    = {\url{https://isa-afp.org/entries/Card_Equiv_Relations.html},
            Formal proof development},
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}

@article{alon1999,
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}
