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@article{SF_1990__40_1_135028, author = {J. Almeida}, title = {Semidirectly closed pseudovarieties of locally trivial semigroups.}, journal = {Semigroup forum}, pages = {315--324}, publisher = {mathdoc}, volume = {40}, number = {1}, year = {1990}, zbl = {0711.20032}, url = {http://geodesic.mathdoc.fr/item/SF_1990__40_1_135028/} }
J. Almeida. Semidirectly closed pseudovarieties of locally trivial semigroups.. Semigroup forum, Tome 40 (1990) no. 1, pp. 315-324. http://geodesic.mathdoc.fr/item/SF_1990__40_1_135028/