1. Tondl, A.: Some Problems of Rotor Dynamics. Czechoslivak Academy of Science, Prague 1965, and London 1965.
2. Dimentberg, F. M.: The Flexural Vibration of Rotating Shafts. London 1961.
3. Black, H. F.; McTernan, A. J.: Vibration of a Rotaing Asymmetric Shaft Supported in Asymmetric Bearings. J. Mech. Engng. Sci. (1968) No. 3.
4. Maclachlan, N. W.: Theory and Application of Mathieu Functions. Oxford 1967.
5. Bishop, R. E. D.; Parkinson, A. G.: Second Order Vibration of Flexible Shafts, Philos. Trans. Roy. Soc. London 259 (1965) No. 1095. New/York/Toronto/London 1956.