%0 Journal Article %T On the Nilpotency of Nil Subrings %J Canadian journal of mathematics %D 1970 %P 1211-1216 %V 22 %N 6 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-139-1/ %R 10.4153/CJM-1970-139-1 %F 10_4153_CJM_1970_139_1