1. Shear wave measurements of the elasticity of the ground
2. A Comparison of Four Geophysical Methods for Determining the Shear Wave Velocity of Soils
3. Seismic field methods for in situ moduli;Ballard;Proceedings of the Conference on In Situ Measurement of Soil Properties,1975
4. Bullen K.E. 1963. An Introduction to the Theory of Seismology. Cambridge University Press, Cambridge.
5. Butcher A.P. Powell J.J.M. 1996. Practical considerations for field geophysical techniques used to assess ground stiffness. In: Craig C. (ed.) Proceedings of the International Conference on Advances in Site Investigation Practice. Thomas Telford, London, 701–714.