%0 Journal Article
%A Mendelsohn, E.
%T An elementary characterization of the category of relational systems
%J Commentationes Mathematicae Universitatis Carolinae
%D 1969
%P 571-588
%V 10
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1969__10_4_a3/
%G en
%F CMUC_1969__10_4_a3