%0 Journal Article %A Soukup, Lajos %T A non-special $\omega_2$-tree with special $\omega_1$-subtrees %J Commentationes Mathematicae Universitatis Carolinae %D 1990 %P 607-612 %V 31 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1990__31_3_a20/ %G en %F CMUC_1990__31_3_a20