@article{GDZPPN001253921, title = {Quasi-ideals in rings and semigroups}, journal = {Semigroup forum}, volume = {20}, year = {1980}, pages = {371-372}, url = {http://dml.mathdoc.fr/item/GDZPPN001253921} }
Steinfeld, O. Quasi-ideals in rings and semigroups. Semigroup forum, Tome 20 (1980) pp. 371-372. http://gdmltest.u-ga.fr/item/GDZPPN001253921/