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@article{DAN_1979_249_3_a1, author = {V. A. Ginzburg}, title = {The method of orbits and perturbation theory}, journal = {Doklady Akademii Nauk}, pages = {525--528}, publisher = {mathdoc}, volume = {249}, number = {3}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_249_3_a1/} }
V. A. Ginzburg. The method of orbits and perturbation theory. Doklady Akademii Nauk, Tome 249 (1979) no. 3, pp. 525-528. http://geodesic.mathdoc.fr/item/DAN_1979_249_3_a1/