%0 Journal Article %A A. A. Bovdi %A A. StrojnowskI %T On the multiplicative subgroup of a group ring %J Banach Center Publications %D 1990 %P 13-16 %V 26 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/-26-1-13-16/ %R 10.4064/-26-1-13-16 %G en %F 10_4064__26_1_13_16