@article{AUCMP_1997__38_1_a2,
     author = {Kepka, T. and Trch, M.},
     title = {Groupoids and the associative law {VI.} {(Sz\'asz-H\'ajek} groupoids of type (a, b, c))},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {13--22},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1997},
     mrnumber = {1489849},
     zbl = {0889.20040},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1997__38_1_a2/}
}