%0 Journal Article %A Wójtowicz, Marek %T An elementary proof of a theorem on sublattices of finite codimension %J Commentationes Mathematicae Universitatis Carolinae %D 1998 %P 99-100 %V 39 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1998__39_1_a10/ %G en %F CMUC_1998__39_1_a10