@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/