@article{SF_1995__50_3_135368,
     author = {J. Meng},
     title = {Implicative commutative semigroups are equivalent to a class of {BCK} algebras.},
     journal = {Semigroup forum},
     pages = {89--96},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {1995},
     zbl = {0807.06011},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135368/}
}