1. Bond, L.J.: “Finite difference methods applied to ultrasonic non-destructive testing problems”. Proc. ARPA/AFML Review of Progress in Quantitative NDE, La Jolla, USA, July 8–13, pp 310–320 (1979).
2. Ambersley, M.D., Bond, L.J., Downie, A.L., Pitt, C.W., Sinclair, D.A. and Smith, I.R.: “The application of ultrasonics in non-destructive testing: a review of some of the research at University College London”, Proc. DARPA/AFML Review of Progress in Quantitative NDE, La Jolla, Calif., USA, July 1980.
3. Ilan, A.: “Finite difference modelling for P-pulse propagation in elastic media with arbitrary polygonal surfaces”, Geophysics, 43 pp 41–58 (1977).
4. Harumi, K., Saito, T. and Fujimori, T.: Proc. 2nd Congress Federation of Acoustical Societies of Europe, Warszawa, September 1978, Paper No. 11–12.
5. Graff, K.F.: “Wave motion in elastic solids”. Clarendon Press (Oxford), (1975).