@article{GDZPPN00126186X, title = {Perfect elements in Dubreil-Jacotin regular semigroups.}, journal = {Semigroup forum}, volume = {44}, year = {1992}, pages = {55-62}, zbl = {0778.06012}, url = {http://dml.mathdoc.fr/item/GDZPPN00126186X} }
Blyth, T.S.; Giraldes, E. Perfect elements in Dubreil-Jacotin regular semigroups.. Semigroup forum, Tome 44 (1992) pp. 55-62. http://gdmltest.u-ga.fr/item/GDZPPN00126186X/