Representation of Markoff's binary quadratic forms by geodesics on a perforated torus Harvey Cohn (1971) Acta Arithmetica
Rétractions dans les espaces stratifiables Robert Cauty (1974) Bulletin de la Société Mathématique de France
Simplicial T-complexes and crossed complexes: a non-abelian version of a theorem of Dold and Kan [Book] N. Ashley (1988)
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