@article{GDZPPN001249819, title = {A completion theorem for finitely generated commutative semigroups.}, journal = {Semigroup forum}, volume = {7}, year = {1974}, pages = {164-168}, zbl = {0303.20046}, url = {http://dml.mathdoc.fr/item/GDZPPN001249819} }
Grillet, Pierre Antoine. A completion theorem for finitely generated commutative semigroups.. Semigroup forum, Tome 7 (1974) pp. 164-168. http://gdmltest.u-ga.fr/item/GDZPPN001249819/