TY  - JOUR
AU  - V. V. Fedorchuk
TI  - On $\pi$-sets
JO  - Doklady Akademii Nauk
PY  - 1977
SP  - 1060
EP  - 1063
VL  - 233
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1977_233_6_a12/
LA  - ru
ID  - DAN_1977_233_6_a12
ER  -