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@article{DAN_1969_185_6_a6, author = {E. S. Lyapin}, title = {Independence of subsemigroups of a semigroup}, journal = {Doklady Akademii Nauk}, pages = {1229--1231}, publisher = {mathdoc}, volume = {185}, number = {6}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_6_a6/} }
E. S. Lyapin. Independence of subsemigroups of a semigroup. Doklady Akademii Nauk, Tome 185 (1969) no. 6, pp. 1229-1231. http://geodesic.mathdoc.fr/item/DAN_1969_185_6_a6/