@article{GDZPPN001257838, title = {Certain subsemigroups of orthodox semigroups.}, journal = {Semigroup forum}, volume = {31}, year = {1985}, pages = {183-188}, zbl = {0571.20060}, url = {http://dml.mathdoc.fr/item/GDZPPN001257838} }
Venkatesan, P.S. Certain subsemigroups of orthodox semigroups.. Semigroup forum, Tome 31 (1985) pp. 183-188. http://gdmltest.u-ga.fr/item/GDZPPN001257838/