%0 Journal Article
%A Čihák, Pavel
%T A combinatorial theorem on the existence of a separating element and its applications to sequences and $\sigma$-derivations of measures
%J Commentationes Mathematicae Universitatis Carolinae
%D 1969
%P 593-611
%V 10
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1969__10_4_a5/
%G en
%F CMUC_1969__10_4_a5