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@article{DAN_1990_313_2_a2, author = {V. I. Zubov}, title = {Normal form of the phase space of a mechanical system}, journal = {Doklady Akademii Nauk}, pages = {273--276}, publisher = {mathdoc}, volume = {313}, number = {2}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_313_2_a2/} }
V. I. Zubov. Normal form of the phase space of a mechanical system. Doklady Akademii Nauk, Tome 313 (1990) no. 2, pp. 273-276. http://geodesic.mathdoc.fr/item/DAN_1990_313_2_a2/