@article{GDZPPN001255908, title = {Semigroups in which ... and ... coincide for regular elements.}, journal = {Semigroup forum}, volume = {24}, year = {1982}, pages = {383-385}, zbl = {0499.54032}, url = {http://dml.mathdoc.fr/item/GDZPPN001255908} }
Magill, J.D. jr. Semigroups in which ... and ... coincide for regular elements.. Semigroup forum, Tome 24 (1982) pp. 383-385. http://gdmltest.u-ga.fr/item/GDZPPN001255908/