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@article{AM2_1981__23_136890, author = {George M. Bergman}, title = {Hyperidentities of groups and semigroups.}, journal = {Aequationes mathematicae}, pages = {50--65}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0453.08003}, url = {http://geodesic.mathdoc.fr/item/AM2_1981__23_136890/} }
George M. Bergman. Hyperidentities of groups and semigroups.. Aequationes mathematicae, Tome 23 (1981), pp. 50-65. http://geodesic.mathdoc.fr/item/AM2_1981__23_136890/