%0 Journal Article %A Kwela, A. %A Zakrzewski, P. %T Combinatorics of ideals --- selectivity versus density %J Commentationes Mathematicae Universitatis Carolinae %D 2017 %P 261-266 %V 58 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14712/1213-7243.2015.203/ %R 10.14712/1213-7243.2015.203 %G en %F 10_14712_1213_7243_2015_203