The exact analytical solution for the plane S wave, propagating along the axis of spirality in the simple 1-D anisotropic "twisted crystal" model is numerically compared with eight approximate ray-theory solutions of various provenance.
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Bulant, P., Klimes, L. & Psencik, I.: Comparison of ray methods with the exact solution in the 1-D anisotropic "twisted crystal" model. In: Seismic Waves in Complex 3-D Structures, Report 8, pp. 119-126, Dep. Geophys., Charles Univ., Prague, 1999.