@article{1102945714, author = {Norris, Eugene M.}, title = {Relationally induced semigroups.}, journal = {Pacific J. Math.}, volume = {49}, number = {2}, year = {1973}, pages = { 203-207}, language = {en}, url = {http://dml.mathdoc.fr/item/1102945714} }
Norris, Eugene M. Relationally induced semigroups.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 203-207. http://gdmltest.u-ga.fr/item/1102945714/