1. Miklowitz, J.: Recent developments in elastic wave propagation. Appl. Mech. Rev.13, 865?878 (1960).
2. Kolsky, H.: Stress Waves in Solids, Oxford: Clarendon Press, 1953.
3. Abramson, H. N., H. J. Plass andE. A. Ripperger: Stress wave propagation in rods and beams. Advanc. Appl. Mech.,5, 111?194, New York, N. Y., 1958.
4. Green, W. A.: Dispersion relations for elastic waves in bars. Progr. Solid Mech., Vol 1, 223?261, Amsterdam. North Holland Publ. Co., 1960.
5. Voigt, W.: Über innere Reibung fester Körper, insbesondere der Metalle. Ann. Phys. Chem.,47, 671?693 (1892).