TY  - JOUR
AU  - P. A. Biryukov
TI  - Ranks of families of sets and properties of topological spaces
JO  - Doklady Akademii Nauk
PY  - 1981
SP  - 777
EP  - 779
VL  - 257
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1981_257_4_a0/
LA  - ru
ID  - DAN_1981_257_4_a0
ER  -