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S. Crampin; Y. Gao (2006). "A review of techniques for measuring shear-wave splitting above small earthquakes". Physics of the Earth and Planetary Interiors. 159 (1–2): 1–14. Bibcode:2006PEPI..159....1C. doi:10.1016/j.pepi.2006.06.002.
E. LaBarre; T. Davis; R. Benson (March 19, 2008). "Finding the sweet spot". E&P. Archived from the original on September 6, 2014. Retrieved June 5, 2012.