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@article{SF_1981__23_134524, author = {G.T. Clarke}, title = {Semigroup varieties of inflations of unions of groups.}, journal = {Semigroup forum}, pages = {311--320}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0486.20033}, url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134524/} }
G.T. Clarke. Semigroup varieties of inflations of unions of groups.. Semigroup forum, Tome 23 (1981), pp. 311-320. http://geodesic.mathdoc.fr/item/SF_1981__23_134524/