@article{PIM_1980_N_S_28_42_a13,
     author = {Aleksandar Krape\v{z}},
     title = {Generalized {Associativity} on {Grupoids}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {105 },
     publisher = {mathdoc},
     volume = {_N_S_28},
     number = {42},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1980_N_S_28_42_a13/}
}