%0 Journal Article %A Groenewald, N. J. %T Units of the Group Ring %J Canadian mathematical bulletin %D 1980 %P 445-448 %V 23 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1980-065-0/ %R 10.4153/CMB-1980-065-0 %F 10_4153_CMB_1980_065_0