%0 Journal Article %A Marek, Wiktor V. %A Sochor, AntonĂ­n %T On a weak Kelley-Morse theory of classes %J Commentationes Mathematicae Universitatis Carolinae %D 1978 %P 371-381 %V 19 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1978__19_2_a12/ %G en %F CMUC_1978__19_2_a12