@article{SF_1996__52_3_135456,
     author = {J.C. Rosales},
     title = {On numerical semigroups.},
     journal = {Semigroup forum},
     pages = {307--318},
     year = {1996},
     volume = {52},
     number = {3},
     zbl = {0853.20041},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__52_3_135456/}
}