1. 1Thomson, W. T., Vibration Theory and Applications, Prentice-Hall, Englewood Cliffs, N.J., 1965, pp.287-313.
2. 2Timoshenko, S., Vibration Problems in Engineering, Van Nostrand, Princeton, N.J., 1955, pp.455-461.
3. 3Pestel, E. C. and Leckie, F. A., Matrix Methods In Elastomechanics, McGraw-Hill, NewYork, 1963, pp.383-384, 403-408.
4. 4Crandall, S. H. Dynamics of Mechanical and Electromechanical Systems, McGraw-Hill, New York, 1968, pp.115-128.
5. 5Meirovitch, L., Analytical Methods in Vibrations, Macmillan, New York, 1967, pp.207-235.