@misc{10_4153_CJM_1970_139_1,
     title = {On the {Nilpotency} of {Nil} {Subrings}},
     journal = {Canadian journal of mathematics},
     pages = {1211--1216},
     year = {1970},
     volume = {22},
     number = {6},
     doi = {10.4153/CJM-1970-139-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-139-1/}
}