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@article{SF_1995__50_3_135384, author = {J.C. Rosales}, title = {On finitely generated submonoids of {N} k}, journal = {Semigroup forum}, pages = {251--262}, publisher = {mathdoc}, volume = {50}, number = {3}, year = {1995}, zbl = {0831.20080}, url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135384/} }
J.C. Rosales. On finitely generated submonoids of N k. Semigroup forum, Tome 50 (1995) no. 3, pp. 251-262. http://geodesic.mathdoc.fr/item/SF_1995__50_3_135384/