von Frese, R.R.B., W.J. Hinze, L.W. Braile, and A.J. Luca. “Spherical-Earth Gravity and Magnetic Anomaly Modeling by Gauss-Legendre Quadrature Integration”. Journal of Geophysics 49, no. 1 (January 22, 1981): 234-242. Accessed October 21, 2025. https://journal.geophysicsjournal.com/JofG/article/view/163.