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@article{SF_1987__36_134901, author = {L. Pol\'ak}, title = {On varieties of completely regular semigroups {II.}}, journal = {Semigroup forum}, pages = {253--284}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0638.20032}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134901/} }
L. Polák. On varieties of completely regular semigroups II.. Semigroup forum, Tome 36 (1987), pp. 253-284. http://geodesic.mathdoc.fr/item/SF_1987__36_134901/