%0 Journal Article %A Kepka, Tomáš %A Trch, Milan %T Groupoids and the associative law I. (Associative triples) %J Acta Universitatis Carolinae. Mathematica et Physica %D 1992 %P 69-86 %V 33 %N 1 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/AUCMP_1992__33_1_a6/ %G en %F AUCMP_1992__33_1_a6