1. J. P. den Hartog,Mechanical Vibrations, McGraw Hill, New York, 1934.
2. E. C. König,Analysis for calculating lateral vibration characteristics of rotating systems with any number of flexible supports, Part. I, The Method of Analysis, J. Appl. Mech., 28, pp. 585–590, 1961.
3. A. E. H. Love,The mathematical theory of elasticity, Cambridge University Press, 1893.
4. S. Timoshenko,Vibration Problems in Engineering, Van Nostrand, New York, 1937.
5. F. M. Dimentberg,Flexural Vibrations of Rotating Shafts, Butterworth, 1959.