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Flaška, Václav ; Jančařík, Antonín ; Kala, Vítězslav ; Kepka, Tomáš
Trees in commtative nil-semigroups of index two. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 48 (2007), issue 1, pp. 81-101
MSC: 05C05, 05E99, 20M14 | MR 2517611 | Zbl 1169.20310
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