TY  - JOUR
AU  - P. L. Ul'yanov
TI  - On a~countable base and the conjugate class of a~topological space
JO  - Sbornik. Mathematics
PY  - 1976
SP  - 13
EP  - 33
VL  - 29
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1976_29_1_a2/
LA  - en
ID  - SM_1976_29_1_a2
ER  -