@article{MASLO_1965_15_1_a1,
     author = {H\'ajek, Petr},
     title = {Die {Sz\'aszchen} {Gruppoide}},
     journal = {Mathematica slovaca},
     pages = {15--42},
     year = {1965},
     volume = {15},
     number = {1},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1965_15_1_a1/}
}