Trees in commtative nil-semigroups of index two
Acta Universitatis Carolinae. Mathematica et Physica, Tome 48 (2007) no. 1, pp. 81-101.

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Classification : 05C05, 05E99, 20M14 
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     title = {Trees in commtative nil-semigroups of index two},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {81--101},
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Flaška, Václav; Jančařík, Antonín; Kala, Vítězslav; Kepka, Tomáš. Trees in commtative nil-semigroups of index two. Acta Universitatis Carolinae. Mathematica et Physica, Tome 48 (2007) no. 1, pp. 81-101. https://geodesic-test.mathdoc.fr/item/AUCMP_2007__48_1_a6/