Appendix E, Appendix F, Formulas.py, GV_VxVy.nb, GGT_VxyVxzVyz.nb, and GC_VxxxVxxyVxyzVyyxVyyyVzzxVzzy.nb
Deng XL, Sneeuw N. (2023). Analytical Solutions for Gravitational Potential up to Its Third-order Derivatives of a Tesseroid, Spherical Zonal Band, and Spherical Shell. Surveys in Geophysics. https://doi.org/10.1007/s10712-023-09774-z