TY  - JOUR
AU  - Sh. Sh. Kary-Niyazov
TI  - Classes of co-absoluteness of Borel and hyper-Borel sets
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1990
SP  - 21
EP  - 26
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1990_4_a5/
LA  - ru
ID  - VMUMM_1990_4_a5
ER  -