1. Knowles, J. A. “Large amplitude oscillations of a tube of incompressible elastic material”, Quart. Appl. Math. 18, (1960).
2. Jaunzemis, W. “Continuum Mechanics”, New York MacMillan (1976).
3. Eringen, A. C. and Suhuby, E. S. “Elastodynamics”, New York Academic Press, 1974–75.
4. Hale, J. K. “Ordinary differential equations”, Wiley, New York, 1969.
5. Hartman, P. “Ordinary differential equations”, Wiley, New York, 1964.