@article{PIM_1981_N_S_30_44_a12,
     author = {Aleksandar Krape\v{z}},
     title = {Functional {Equations} of {Generalized} {Associativity,} {Bisymmetry,} {Transitivity} and {Distributivity}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {81 },
     publisher = {mathdoc},
     volume = {_N_S_30},
     number = {44},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_30_44_a12/}
}