@article{SF_1974__8_134035,
     author = {Pierre Antoine Grillet},
     title = {A completion theorem for finitely generated commutative semigroups.},
     journal = {Semigroup forum},
     pages = {164--168},
     year = {1974},
     volume = {8},
     zbl = {0303.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__8_134035/}
}