Geodesic
On sufficient orbits of a group of contact diffeomorphisms
Sbornik. Mathematics, Tome 33 (1977) no. 2, pp. 223-242
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The coincidence of formal and actual sufficiency for orbits of the adjoint and conjugate actions of the group of germs of contact diffeomorphisms is proved. Bibliography: 6 titles. 
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V. V. Lychagin. On sufficient orbits of a group of contact diffeomorphisms. Sbornik. Mathematics, Tome 33 (1977) no. 2, pp. 223-242. http://geodesic.mathdoc.fr/item/SM_1977_33_2_a3/

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[4] J. Williamson, “On the normal forms of linear canonical transformations in dynamics”, Amer. J. Math., 59:3 (1937), 599–61 | DOI | MR

[5] V. V. Lychagin, “Lokalnaya klassifikatsiya nelineinykh differentsialnykh uravnenii v chastnykh proizvodnykh pervogo poryadka”, Uspekhi matem. nauk, XXX:1(181) (1975), 101–171

[6] A. Weinstein, “Symplectic manifolds and their Lagrangian submanifolds”, Adw. Math., 6 (1971), 329–346 | DOI | MR | Zbl