Červeny, V., and J. Jech. “Linearized Solutions of Kinematic Problems of Seismic Body Waves in Inhomogeneous Slightly Anisotropic Media”. Journal of Geophysics 51, no. 1 (July 29, 1982): 96-104. Accessed September 21, 2025. https://journal.geophysicsjournal.com/JofG/article/view/175.