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�References� `@=vt1. Tao, L., Song, H. and Chakrabarti, S. \Scaled boundary

FEM solution of short-crested wave di�raction by a ver-tical cylinder", Computer Methods in Applied Mechanicsand Engineering, 197(1-4), pp. 232-242 (2007).

2. Xia, J., Nyquist, J.E., Xu, Y., Roth, M.J.S. and Miller,R.D. \Feasibility of detecting near-surface feature withRayleigh-wave di�raction", Journal of Applied Geo-physics, 62(3), pp. 244-253 (2007).

3. Antonio, J. and Tadeu, A. \3D scattering scattering bymultiple cylindrical cavities buried in an elastic forma-tion", Eur. J. Mech. A/Solids, 20(3), pp. 367-383 (2001).

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Tunnelling and Underground Space Technology, 21(5),pp. 511-519 (2006).

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