%0 Journal Article
%A Kučera, Luděk
%T A shrinking of a category of societies is a universal partly ordered class
%J Commentationes Mathematicae Universitatis Carolinae
%D 1971
%P 401-411
%V 12
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1971__12_2_a14/
%G en
%F CMUC_1971__12_2_a14