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@article{AM2_1981__22_136883, author = {George M. Bergman}, title = {Hyperidentities of groups and semigroups. {(Short} {Communication).}}, journal = {Aequationes mathematicae}, pages = {315--317}, publisher = {mathdoc}, volume = {22}, year = {1981}, zbl = {0453.08003}, url = {http://geodesic.mathdoc.fr/item/AM2_1981__22_136883/} }
George M. Bergman. Hyperidentities of groups and semigroups. (Short Communication).. Aequationes mathematicae, Tome 22 (1981), pp. 315-317. http://geodesic.mathdoc.fr/item/AM2_1981__22_136883/