1. Poisson S.D.: L’equilibre et le movementde corps elastiques. Memoares L’Academie Royale Sciences L’Institute de France 8, 357–570 (1829)
2. Rayleigh, L.: Theory of Sound. vol. 1 (reprinted 1945 by Dover, New York). Macmillan, London (1945)
3. Timoshenko S.: Vibration Problems in Engineering. D. Van Nostrand Company, Inc., New York (1937)
4. Graff K.F.: Wave Motion in Elastic Solids. Clarendon Press, Oxford (1975)
5. Biancolini M.E., Brutti C., Reccia L.: Approximate solution for free vibrations of thin orthotropic rectangular plates. Journal of Sound and Vibration 288, 321–344 (2005)