@article{1029001062, author = {Knowles, Frank}, title = {Semigroups with identity on $E^3$.}, journal = {Michigan Math. J.}, volume = {20}, number = {1}, year = {1973}, pages = { 161-167}, language = {en}, url = {http://dml.mathdoc.fr/item/1029001062} }
Knowles, Frank. Semigroups with identity on $E^3$.. Michigan Math. J., Tome 20 (1973) no. 1, pp. 161-167. http://gdmltest.u-ga.fr/item/1029001062/