%0 Journal Article %A Trlifaj, Jan %T Direct finiteness of group rings - a simple proof of the Kaplansky's conjecture for finite groups %J Commentationes Mathematicae Universitatis Carolinae %D 1990 %P 427-429 %V 31 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1990__31_3_a3/ %G en %F CMUC_1990__31_3_a3