@article{AUCMP_1994__35_1_a3,
     author = {Kepka, Tom\'a\v{s} and Trch, Milan},
     title = {Groupoids and the associative law {IV.} {(Sz\'asz-H\'ajek} {Groupoids} of {Type} {(A,} {B,} {A))}},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {31--42},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1994},
     mrnumber = {1366490},
     zbl = {0819.20075},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1994__35_1_a3/}
}