@article{GDZPPN001254642, title = {Semigroups whose regular ... -classes form well-ordered chains.}, journal = {Semigroup forum}, volume = {23}, year = {1981}, pages = {89-92}, zbl = {0488.54024}, url = {http://dml.mathdoc.fr/item/GDZPPN001254642} }
Subbiah, S.; Magill, K.D. jr. Semigroups whose regular ... -classes form well-ordered chains.. Semigroup forum, Tome 23 (1981) pp. 89-92. http://gdmltest.u-ga.fr/item/GDZPPN001254642/