Onnis, Luciano Emanuel, and José Carcione. “A Seismic Ray-Tracing Method Based on Fibonacci Search”. Annals of Geophysics 60, no. 2 (May 2, 2017): S0220. Accessed December 5, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/7128.