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@article{SF_1988__37_1_134914, author = {Jorge Almeida}, title = {Some pseudovariety joins involving the pseudovariety of finite groups.}, journal = {Semigroup forum}, pages = {53--58}, publisher = {mathdoc}, volume = {37}, number = {1}, year = {1988}, zbl = {0633.20040}, url = {http://geodesic.mathdoc.fr/item/SF_1988__37_1_134914/} }
Jorge Almeida. Some pseudovariety joins involving the pseudovariety of finite groups.. Semigroup forum, Tome 37 (1988) no. 1, pp. 53-58. http://geodesic.mathdoc.fr/item/SF_1988__37_1_134914/