@article{GDZPPN002354039, title = {Commutative subrings of periodic rings.}, journal = {Mathematica Scandinavica}, volume = {38}, year = {1976}, pages = {161-166}, zbl = {0344.16023}, url = {http://dml.mathdoc.fr/item/GDZPPN002354039} }
Laffey, Thomas J. Commutative subrings of periodic rings.. Mathematica Scandinavica, Tome 38 (1976) pp. 161-166. http://gdmltest.u-ga.fr/item/GDZPPN002354039/