@article{SF_1991__43_3_135123,
     author = {F. Decruyenaere and E. Jespers and P. Wauters},
     title = {On commutative principal ideal semigroup rings.},
     journal = {Semigroup forum},
     pages = {367--377},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1991},
     zbl = {0731.20041},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135123/}
}