1. Lorenz, H.: Technische Elastizitätslehre. München Berlin: Oldenburg 1913.
2. Cottrell, A. H.: The mechanical properties of matter. New York: J. Wiley 1964.
3. Love, A. E. H.: A treatise on the mathematical theory of elasticity, 4th ed., pp. 281?284. New York: Dover Publications 1944.
4. Pochhammer, L.: Über die Fortpflanzungsgeschwindigkeiten kleiner Schwingungen in einem unbegrenzten isotropen Kreiszylinder. J. Math. (Crelle)81, p. 324 (1876); cited in [3], p. 287.
5. Chree, C.: The equations of an isotropic elastic solid in polar and cylindrical coordinates, their solution and application. Cambridge Phil. Soc. Trans.14 (1889); cited in [3], p. 278.