Document Zbl 0272.20055

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Algebre Theorie Nombres, Sem. P. Dubreil, M.-L. Dubreil-Jacotin, L. Lesieur et C. Pisot 16 (1962/63), No. 9, 26 p. (1967).

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20L05

Groupoids (i.e. small categories in which all morphisms are isomorphisms)

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