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@article{SF_1986__33_134820, author = {J. Almeida}, title = {Power pseudovarieties of semigroups {II.}}, journal = {Semigroup forum}, pages = {375--390}, publisher = {mathdoc}, volume = {33}, year = {1986}, zbl = {0588.20034}, url = {http://geodesic.mathdoc.fr/item/SF_1986__33_134820/} }
J. Almeida. Power pseudovarieties of semigroups II.. Semigroup forum, Tome 33 (1986), pp. 375-390. http://geodesic.mathdoc.fr/item/SF_1986__33_134820/