@article{SF_1977__15_134232,
     author = {C. C. Edmunds},
     title = {On certain finitely based varieties of semigroups.},
     journal = {Semigroup forum},
     pages = {21--40},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0375.20057},
     url = {http://geodesic.mathdoc.fr/item/SF_1977__15_134232/}
}