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@article{SF_1984__30_134706, author = {N.R. Reilly and J. Almeida}, title = {Generalized varieties of commutative and nilpotent semigroups.}, journal = {Semigroup forum}, pages = {77--98}, publisher = {mathdoc}, volume = {30}, year = {1984}, zbl = {0528.20042}, url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134706/} }
N.R. Reilly; J. Almeida. Generalized varieties of commutative and nilpotent semigroups.. Semigroup forum, Tome 30 (1984), pp. 77-98. http://geodesic.mathdoc.fr/item/SF_1984__30_134706/