@article{AUCMP_1995__36_1_a3,
     author = {Kepka, Tom\'a\v{s} and Trch, Milan},
     title = {Groupoids and the associative law {III.} {(Sz\'asz-H\'ajek} groupoids)},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {17--30},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {1995},
     mrnumber = {1366505},
     zbl = {0828.20071},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1995__36_1_a3/}
}