%0 Journal Article %A Dikranjan, Dikran N. %A Giuli, Eraldo %T Ordinal invariants and epimorphisms in some categories of weak Hausdorff spaces %J Commentationes Mathematicae Universitatis Carolinae %D 1986 %P 395-417 %V 27 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1986__27_2_a16/ %G en %F CMUC_1986__27_2_a16