TY  - JOUR
AU  - Mendelsohn, E.
TI  - An elementary characterization of the category of relational systems
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1969
SP  - 571
EP  - 588
VL  - 10
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1969__10_4_a3/
LA  - en
ID  - CMUC_1969__10_4_a3
ER  -