TY  - JOUR
AU  - V. V. Kozlov
TI  - Topological obstructions to the integrability of natural mechanical systems
JO  - Doklady Akademii Nauk
PY  - 1979
SP  - 1299
EP  - 1302
VL  - 249
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1979_249_6_a3/
LA  - ru
ID  - DAN_1979_249_6_a3
ER  -