For a reference on exact VTI coefficients see Daley & Hron, 1977, "Reflection and transmission coefficients for transversely isotropic solids", Bull. Seis. Soc. Am., 67, 661-675. For a reference on linearized VTI coefficients see Ruger, 1997, "P-wave reflection coefficients for transversely isotropic models with vertical and horizontal axis of symmetry", Geophysics, 62, 713-722.
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