References
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- Aki, K., & Richards, P. G. (1980). Quantitative seismology: theory and methods. San Francisco: W. H. Freeman.
- Dahlen, F. A., & Tromp, J. (1998). Theoretical global seismology. Princeton, N.J: Princeton University Press.
- Frohlich, C. (1996). Cliff's Nodes Concerning Plotting Nodal Lines for P, SH and SV. Seismological Research Letters, 67(1), 16–24. https://doi.org/10.1785/gssrl.67.1.16
- Lay, T., & Wallace, T. C. (1995). Modern global seismology. San Diego: Academic Press.

Author
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Genevieve Patau, `Laboratory of Seismogenesis <http://www.ipgp.fr/rech/sismogenese/>`_,
Institut de Physique du Globe de Paris, Departement de Sismologie, Paris, France