TY  - JOUR
AU  - A. M. Vinogradov
TI  - On the second obstruction to cross-sections
JO  - Doklady Akademii Nauk
PY  - 1960
SP  - 723
EP  - 725
VL  - 130
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1960_130_4_a1/
LA  - ru
ID  - DAN_1960_130_4_a1
ER  -