@article{AUCMP_1997_38_1_a3,
     author = {Dr\'apal, A. and Kepka, T.},
     title = {Groupoids and the associative law {VIII.} {(Diagonally} {Non-Associative} {Groupoids)}},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {23--37},
     year = {1997},
     volume = {38},
     number = {1},
     mrnumber = {1489850},
     zbl = {0889.20041},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1997_38_1_a3/}
}