1. A. P. Filippov, Vibration of Elastic Systems [in Russian], AN USSR, Kiev (1956).
2. A. P. Filippov, Vibrations of Mechanical Systems [in Russian], Naukova Dumka, Kiev (1965).
3. A. P. Filippov, Vibrations of Deformable Systems [in Russian], 2nd edition, Mashinostroenie, Moscow (1970).
4. G. S. Pisarenko, O. L. Kvitka, and E. S. Umanskyi, Strength of Materials [in Ukrainian], Vyshcha Shkola, Kiev (2004).
5. G. S. Pisarenko, A. P. Yakovlev, and V. V. Matveev, Handbook of Strength of Materials [in Russian], Naukova Dumka, Kiev (1988).