@article{GDZPPN001259105, title = {On varieties of completely regular semigroups II.}, journal = {Semigroup forum}, volume = {36}, year = {1987}, pages = {253-284}, zbl = {0638.20032}, url = {http://dml.mathdoc.fr/item/GDZPPN001259105} }
Polák, L. On varieties of completely regular semigroups II.. Semigroup forum, Tome 36 (1987) pp. 253-284. http://gdmltest.u-ga.fr/item/GDZPPN001259105/