%0 Journal Article %A Sochor, AntonĂ­n %T Notes on revealed classes %J Commentationes Mathematicae Universitatis Carolinae %D 1985 %P 499-514 %V 26 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1985__26_3_a5/ %G en %F CMUC_1985__26_3_a5