%0 Journal Article
%A L. Szczerba
%T The notion of an elementary subsystem for a Boolean-valued relational system
%J Fundamenta Mathematicae
%D 1973
%P 5-12
%V 80
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-80-1-5-12/
%R 10.4064/fm-80-1-5-12
%G en
%F 10_4064_fm_80_1_5_12