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@article{SF_1982__24_134553, author = {I.O. Korjakov}, title = {A sketch of the lattice of commutative nilpotent semigroup varieties.}, journal = {Semigroup forum}, pages = {285--318}, publisher = {mathdoc}, volume = {24}, year = {1982}, zbl = {0493.20039}, url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134553/} }
I.O. Korjakov. A sketch of the lattice of commutative nilpotent semigroup varieties.. Semigroup forum, Tome 24 (1982), pp. 285-318. http://geodesic.mathdoc.fr/item/SF_1982__24_134553/