Semigroups and the structure of categories
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Jerry R. Beehler, Arnold Johanson (1976)
Mathematica Slovaca
CH. EHRESMANN (1967)
Mathematische Annalen
C. Lair (1996)
Diagrammes
C. Lair (1996)
Diagrammes
C. Lair (1996)
Diagrammes
C. Henry (1986)
Diagrammes
F. Cury (1979)
Diagrammes
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