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References
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| 1. |
Moser J., “Convergent series expansions for quasi-periodic motions”, Math. Ann., 169 (1967), 136–176   |
| 2. |
Bibikov Yu.N., Multifrequency nonlinear oscillations and their bifurcations, Leningrad University Press, L., 1991 (Russian) |
| 3. |
Lyapunov A.M., “Investigation of one particular case of the problem of stability of motion.”, Collected works, v. 2, Izdatel'stvo AN SSSR, M.–L., 1956, 272–331 (Russian) |
| 4. |
Bibikov Yu.N., “Application of Moser's theorem to the study of differential equations of nonlinear oscillations”, Dokl. AN SSSR, 225:6 (1975), 1241–1244 (Russian) |
| 5. |
Basov V.V., Bibikov Yu.N., “On the stability of the equilibrium position in one case of periodic perturbation of the center”, Differ. Equ., 33:5 (1997), 587–590 |
| 6. |
Bibikov Yu.N., Savelyeva A.G., “Periodic disturbances of the non-conservative center”, Differ. Equ., 54:3 (2018), 295–299  |
| 7. |
Basov V.V., Bibikov Yu.N., “On the stability of “nonlinear center” under quasiperiodic perturbations”, Vestnik St Petersb. Univ. Math., 53 (2020), 174–179 |
