TY  - JOUR
AU  - Kučera, Luděk
TI  - A shrinking of a category of societies is a universal partly ordered class
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1971
SP  - 401
EP  - 411
VL  - 12
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1971__12_2_a14/
LA  - en
ID  - CMUC_1971__12_2_a14
ER  -