@article{1103036494, author = {Kennedy, Hubert C.}, title = {Group membership in semigroups.}, journal = {Pacific J. Math.}, volume = {12}, number = {4}, year = {1962}, pages = { 577-580}, language = {en}, url = {http://dml.mathdoc.fr/item/1103036494} }
Kennedy, Hubert C. Group membership in semigroups.. Pacific J. Math., Tome 12 (1962) no. 4, pp. 577-580. http://gdmltest.u-ga.fr/item/1103036494/