%0 Journal Article
%A Clifford, Alfred Hoblitzelle
%A Miller, D. D.
%T Union and symmetry preserving endomorphisms of the semigroup of all binary relations on a set
%J Czechoslovak Mathematical Journal
%D 1970
%P 303-314
%V 20
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100967/
%R 10.21136/CMJ.1970.100967
%G en
%F 10_21136_CMJ_1970_100967