References

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Inman, D.J., 2001. Engineering Vibration. 2nd Edn., Prentice Hall, New Jersey, ISBN: 9780137261420, Pages: 621.

Jang, S.K. and C.W. Bert, 1989. Free vibration of stepped beams: Exact and numerical solutions. J. Sound Vibration, 130: 342-346.
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Jang, S.K. and C.W. Bert, 1989. Free vibration of stepped beams: Higher mode frequencies and effects of steps on frequency. J. Sound Vibration, 132: 164-168.
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Levinson, M., 1976. Vibrations of stepped strings and beams. J. Sound Vibration, 49: 287-291.
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Maurizi, M.J. and P.M. Belles, 1993. Natural frequencies of one-span beams with stepwise variable cross-section. J. Sound Vibration, 168: 184-188.
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Taleb, N.J. and E.W. Suppiger, 1961. Vibration of stepped beam. J. Aerospace Eng., 28: 295-298.