Groupoids and the associative law II. (Groupoids with small semigroup distance)
Acta Universitatis Carolinae. Mathematica et Physica, Tome 34 (1993) no. 1, pp. 67-83.

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Classification : 20N05 
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     author = {Kepka, Tom\'a\v{s} and Trch, Milan},
     title = {Groupoids and the associative law {II.} {(Groupoids} with small semigroup distance)},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {67--83},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1993},
     mrnumber = {1282768},
     zbl = {0809.20056},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_1993__34_1_a2/}
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Kepka, Tomáš; Trch, Milan. Groupoids and the associative law II. (Groupoids with small semigroup distance). Acta Universitatis Carolinae. Mathematica et Physica, Tome 34 (1993) no. 1, pp. 67-83. https://geodesic-test.mathdoc.fr/item/AUCMP_1993__34_1_a2/