TY  - JOUR
AU  - N. V. Ivanova
TI  - Some remarks on the comparison of the strength of set-theoretic operations
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1970
SP  - 34
EP  - 39
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1970_5_a3/
LA  - ru
ID  - IVM_1970_5_a3
ER  -