1. Symplectic geometry and analytical mechanics;Libermann,1987
2. The Lagrange Configuration in Celestial Mechanics;Littlewood;Proc London Math Soc (3),1959
3. An exponential estimate of the time of stability of nearly integrable Hamiltonian systems;Nehorošev;Uspehi Mat Nauk,1977
4. On conservation of conditionally periodic motions for a small change in Hamilton’s function;Kolmogorov;Dokl Akad Nauk SSSR (NS),1954
5. Proof of a theorem of A. N. Kolmogorov on the preservation of conditionally periodic motions under a small perturbation of the Hamiltonian;Arnold́;Uspehi Mat Nauk,1963