1. Vibration and buckling of flexible rotating beams
2. 2Myklestad, N. O., Vibration Analysis, McGraw-Hill, New York, 1994, pp.210-214, 239, 240.
3. 3Den Hartog, J. P., Mechanical Vibrations, 2nd ed.McGraw-Hill, New York, 1948, pp.307-310.
4. 4Morse, P. M., Vibration and Sound, 2nd ed.McGraw-Hill, New York, 1948, pp.114-118.