TY  - JOUR
AU  - Clifford, Alfred Hoblitzelle
AU  - Miller, D. D.
TI  - Union and symmetry preserving endomorphisms of the semigroup of all binary relations on a set
JO  - Czechoslovak Mathematical Journal
PY  - 1970
SP  - 303
EP  - 314
VL  - 20
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100967/
DO  - 10.21136/CMJ.1970.100967
LA  - en
ID  - 10_21136_CMJ_1970_100967
ER  -