@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/}
}