@article{GDZPPN001264060, title = {On finitely generated submonoids of N k}, journal = {Semigroup forum}, volume = {51}, year = {1995}, pages = {251-262}, zbl = {0831.20080}, url = {http://dml.mathdoc.fr/item/GDZPPN001264060} }
Rosales, J.C. On finitely generated submonoids of N k. Semigroup forum, Tome 51 (1995) pp. 251-262. http://gdmltest.u-ga.fr/item/GDZPPN001264060/