@article{SF_1987__36_134883,
     author = {J.S. Ponizovskii},
     title = {Semigroup rings.},
     journal = {Semigroup forum},
     pages = {1--46},
     year = {1987},
     volume = {36},
     url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134883/}
}