%0 Journal Article %A Coleman, D. B. %T On Group Rings %J Canadian journal of mathematics %D 1970 %P 249-254 %V 22 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-032-3/ %R 10.4153/CJM-1970-032-3 %F 10_4153_CJM_1970_032_3