TY  - JOUR
AU  - Sochor, Antonín
TI  - Real classes in the ultrapower of hereditarily finite sets
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1975
SP  - 637
EP  - 640
VL  - 16
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1975__16_4_a2/
LA  - en
ID  - CMUC_1975__16_4_a2
ER  -