@article{GDZPPN001264850, title = {On numerical semigroups.}, journal = {Semigroup forum}, volume = {53}, year = {1996}, pages = {307-318}, zbl = {0853.20041}, url = {http://dml.mathdoc.fr/item/GDZPPN001264850} }
Rosales, J.C. On numerical semigroups.. Semigroup forum, Tome 53 (1996) pp. 307-318. http://gdmltest.u-ga.fr/item/GDZPPN001264850/