@article{1102818024, author = {O'Neill, John D.}, title = {Rings whose additive subgroups are subrings.}, journal = {Pacific J. Math.}, volume = {67}, number = {2}, year = {1976}, pages = { 509-522}, language = {en}, url = {http://dml.mathdoc.fr/item/1102818024} }
O'Neill, John D. Rings whose additive subgroups are subrings.. Pacific J. Math., Tome 67 (1976) no. 2, pp. 509-522. http://gdmltest.u-ga.fr/item/1102818024/