@article{GDZPPN00126219X, title = {Homomorphisms of implicative semigroups.}, journal = {Semigroup forum}, volume = {46}, year = {1993}, pages = {7-15}, zbl = {0776.06012}, url = {http://dml.mathdoc.fr/item/GDZPPN00126219X} }
Shum, K.P.; Chan, M.W. Homomorphisms of implicative semigroups.. Semigroup forum, Tome 46 (1993) pp. 7-15. http://gdmltest.u-ga.fr/item/GDZPPN00126219X/