@article{BUMI_1999_8_2B_1_a4,
     author = {Petrich, Mario and Silva, Pedro V.},
     title = {On presentations of semigroup rings},
     journal = {Bollettino della Unione matematica italiana},
     pages = {127--142},
     publisher = {mathdoc},
     volume = {Ser. 8, 2B},
     number = {1},
     year = {1999},
     zbl = {0924.16022},
     mrnumber = {466355},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1999_8_2B_1_a4/}
}