%0 Journal Article %A Kratochvíl, Jan %T Perfect codes in graphs and their Cartesian powers [Abstract of thesis] %J Commentationes Mathematicae Universitatis Carolinae %D 1989 %P 193-194 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1989__30_1_a25/ %G en %F CMUC_1989__30_1_a25