%0 Journal Article
%A J. Czajsner
%T Some equivalence relations in relational systems
%J Commentationes Mathematicae
%D 1969
%P  81-89
%V 13
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14708/cm.v13i1.5660/
%R 10.14708/cm.v13i1.5660
%G pl
%F 10_14708_cm_v13i1_5660