@article{CMUC_1980__21_2_a14,
     author = {Glastad, Bruce and Hopkins, Glenn},
     title = {Commutative semigroup rings which are principal ideal rings},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {371--377},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1980},
     mrnumber = {580691},
     zbl = {0453.13010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_2_a14/}
}