%0 Journal Article %A Chajda, Ivan %T Relatively pseudocomplemented directoids %J Commentationes Mathematicae Universitatis Carolinae %D 2009 %P 349-357 %V 50 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_2009__50_3_a2/ %G en %F CMUC_2009__50_3_a2