1. Aki, K. and Richards, P. G.: Quantitative Seismology, 2nd Edn., University Science Books, Sausalito, California, 2002.
2. Alford, R. M., Kelly, K. R., and Boore, D. M.: Accuracy of finite difference modeling of the acoustic wave equation, Geophysics, 39, 834–842, 1974.
3. Auld, B. A.: Acoustic fields and waves in solids, J. Wiley and Sons, New York, 18 pp., 1973.
4. Babuska, V.: Anisotropy of Vp and Vs in rock-forming minerals, Geophys. J. R. Astr. Soc, 50, 1–6., 1981.
5. Bachman, R. T.: Acoustic anisotropy in marine sediments and sedimentary rocks, J. Geophys. Res., 84, 7661–7663, 1979.