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@article{DAN_1979_249_6_a3, author = {V. V. Kozlov}, title = {Topological obstructions to the integrability of natural mechanical systems}, journal = {Doklady Akademii Nauk}, pages = {1299--1302}, publisher = {mathdoc}, volume = {249}, number = {6}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_249_6_a3/} }
V. V. Kozlov. Topological obstructions to the integrability of natural mechanical systems. Doklady Akademii Nauk, Tome 249 (1979) no. 6, pp. 1299-1302. http://geodesic.mathdoc.fr/item/DAN_1979_249_6_a3/