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@article{SF_1989__39_2_134979, author = {I.L. Mel'nichuk}, title = {Semigroups with n-closed subsets.}, journal = {Semigroup forum}, pages = {105--108}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1989}, language = {en}, url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134979/} }
I.L. Mel'nichuk. Semigroups with n-closed subsets.. Semigroup forum, Tome 39 (1989) no. 2, pp. 105-108. http://geodesic.mathdoc.fr/item/SF_1989__39_2_134979/