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@article{SF_1991__42_3_135087, author = {M.V. Sapir}, title = {On cross semigroup varieties and related questions.}, journal = {Semigroup forum}, pages = {345--364}, publisher = {mathdoc}, volume = {42}, number = {3}, year = {1991}, zbl = {0741.20042}, url = {http://geodesic.mathdoc.fr/item/SF_1991__42_3_135087/} }
M.V. Sapir. On cross semigroup varieties and related questions.. Semigroup forum, Tome 42 (1991) no. 3, pp. 345-364. http://geodesic.mathdoc.fr/item/SF_1991__42_3_135087/