@article{CMUC_1963__4_3_a0,
     author = {Drbohlav, Karel},
     title = {On finitely generated commutative semigroups},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {87--92},
     publisher = {mathdoc},
     volume = {04},
     number = {3},
     year = {1963},
     mrnumber = {0167549},
     zbl = {0138.02001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1963__4_3_a0/}
}