TY  - JOUR
AU  - D. V. Ranchin
TI  - Tightness, sequentiality and closed coverings
JO  - Doklady Akademii Nauk
PY  - 1977
SP  - 1015
EP  - 1018
VL  - 232
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1977_232_5_a8/
LA  - ru
ID  - DAN_1977_232_5_a8
ER  -