%0 Journal Article %A Iwo Labuda %T Alexander Subbase Theorem for Filters %J Bulletin of the Polish Academy of Sciences. Mathematics %D 2006 %P 147-152 %V 54 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ba54-2-6/ %R 10.4064/ba54-2-6 %G de %F 10_4064_ba54_2_6