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@article{MS2_1976__39_166492, author = {Thomas J. Laffey}, title = {Commutative subrings of periodic rings.}, journal = {Mathematica Scandinavica}, pages = {161--166}, publisher = {mathdoc}, volume = {39}, year = {1976}, zbl = {0344.16023}, url = {http://geodesic.mathdoc.fr/item/MS2_1976__39_166492/} }
Thomas J. Laffey. Commutative subrings of periodic rings.. Mathematica Scandinavica, Tome 39 (1976), pp. 161-166. http://geodesic.mathdoc.fr/item/MS2_1976__39_166492/