Armaël Guéneau, Jacques-Henri Jourdan, Arthur Charguéraud, and François
  Pottier.
Formal proof and analysis of an
  incremental cycle detection algorithm.
In John Harrison, John O'Leary, and Andrew Tolmach, editors, 
  Interactive Theorem Proving (ITP), volume 141 of 
Leibniz International
  Proceedings in Informatics, pages 18:1--18:20, Dagstuhl, Germany, September
  2019. Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik.
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