@article{01780279, title = {On zero subrings and periodic subrings.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {25}, year = {2001}, pages = {413-417}, doi = {10.1155/S0161171201006044}, zbl = {1002.16013}, language = {en}, url = {http://dml.mathdoc.fr/item/01780279} }
Bell, Howard E. On zero subrings and periodic subrings.. International Journal of Mathematics and Mathematical Sciences, Tome 25 (2001) pp. 413-417. doi : 10.1155/S0161171201006044. http://gdmltest.u-ga.fr/item/01780279/