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Bican, L. ; Drápal, A. ; Kepka, T.
Cancellative relations and matrices. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 28 (1987), issue 1, pp. 21-31
MSC: 08A99, 13C99, 15A30, 15A99, 16S50, 20N15 | MR 0929263 | Zbl 0661.20050
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