Geodesic
Representation of semigroups by products of simple graphs
Commentationes Mathematicae Universitatis Carolinae, Tome 30 (1989) no. 2, pp. 227-234

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Classification : 05C38, 05C99, 18A30, 20M14, 20M30 
Puš, Vladimír. Representation of semigroups by products of simple graphs. Commentationes Mathematicae Universitatis Carolinae, Tome 30 (1989) no. 2, pp. 227-234. http://geodesic.mathdoc.fr/item/CMUC_1989_30_2_a2/
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