%0 Journal Article %A Bečvář, Jindřich %T $K$-essential subgroups of abelian groups. III. %J Commentationes Mathematicae Universitatis Carolinae %D 1977 %P 11-18 %V 18 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1977__18_1_a1/ %G en %F CMUC_1977__18_1_a1