@article{GDZPPN001265016, title = {Regularity of semigroup rings.}, journal = {Semigroup forum}, volume = {53}, year = {1996}, pages = {72-81}, zbl = {0852.20056}, url = {http://dml.mathdoc.fr/item/GDZPPN001265016} }
Li, F. Regularity of semigroup rings.. Semigroup forum, Tome 53 (1996) pp. 72-81. http://gdmltest.u-ga.fr/item/GDZPPN001265016/