Cancellative relations and matrices
Acta Universitatis Carolinae. Mathematica et Physica, Tome 28 (1987) no. 1, pp. 21-31.

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Classification : 08A99, 13C99, 15A30, 15A99, 16S50, 20N15 
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Bican, L.; Drápal, A.; Kepka, T. Cancellative relations and matrices. Acta Universitatis Carolinae. Mathematica et Physica, Tome 28 (1987) no. 1, pp. 21-31. https://geodesic-test.mathdoc.fr/item/AUCMP_1987__28_1_a4/