%0 Journal Article
%A Poljak, Svatopluk
%A Turzík, Daniel
%A Pudlák, Pavel
%T Extensions of $k$-subsets to $k+1$-subsets - existence versus constructability
%J Commentationes Mathematicae Universitatis Carolinae
%D 1982
%P 337-349
%V 23
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1982__23_2_a9/
%G en
%F CMUC_1982__23_2_a9