@article{SF_1991__42_3_135061,
     author = {F. Pastijn},
     title = {Pseudovarieties of completely regular semigroups.},
     journal = {Semigroup forum},
     pages = {1--46},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1991},
     zbl = {0719.20031},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__42_3_135061/}
}