1. Malkin, I.G., Nekotorye zadachi teorii nelineinykh kolebanii (Some Problems of the Theory of Nonlinear Oscillations), Moscow: GTTL, 1956.
2. Proskuryakov, A.P., Metod Puankare v teorii nelineinykh kolebanii (Method of Poincaré in the Theory of Nonlinear Oscillations), Moscow: Nauka, 1977.
3. Tkhai, V.N., Lyapunov Families of Periodic Motions in the Invertible System, Prikl. Mat. Mekh., 2000, vol. 64, no. 1, pp. 46–58.
4. Tkhai, V.N., Resonant Lyapunov Families of Periodic Motions of Invertible Systems, Prikl. Mat. Mekh., 2004, vol. 68, no. 3, pp. 384–401.
5. Barabanov, I.N., and Tkhai, V.N., Stabilization of Oscillations from a Monoparametric Family of the Autonomous System, Autom. Remote Control, 2009, no. 2, pp. 203–208.