%0 Journal Article
%A Butkovičová, Eva
%T Ultrafilters without immediate predecessors in Rudin-Frolík order
%J Commentationes Mathematicae Universitatis Carolinae
%D 1982
%P 757-766
%V 23
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1982__23_4_a12/
%G en
%F CMUC_1982__23_4_a12