1. Kolmogorov, A. N., Preservation of Conditionally Periodic Movements with Small Change in the Hamilton Function, in Stochastic Behaviour in Classical and Quantum Hamiltonian Systems (Volta Memorial Conference, Como, 1977), G. Casati, J. Ford (Eds.), Lect. Notes Phys. Monogr., vol. 93, Berlin: Springer, 1979, pp. 51-56
2. see also: Dokl. Akad. Nauk SSSR (N. S.), 1954, vol. 98, pp. 527-530 (Russian).
3. Chierchia, L. and Fascitiello, I.,
Nineteen Fifty-Four: Kolmogorov’s New “Metrical Approach” to Hamiltonian Dynamics,
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4. Chierchia, L. and Argentieri, F.,
Isolated Diophantine Numbers,
Regul. Chaotic Dyn.,
2024, vol. 29, no. 4, pp. 536–540.
5. Feola, R. and Massetti, E.,
Non-Resonant Conditions for the Klein – Gordon Equation on the Circle,
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2024, vol. 29, no. 4, pp. 541–564.