TY  - JOUR
AU  - V. Fedorchuk
TI  - $\theta$-spaces and perfect irreducible mappings of topological spaces
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 757
EP  - 759
VL  - 174
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_174_4_a5/
LA  - ru
ID  - DAN_1967_174_4_a5
ER  -