P. RICHTER and R. PAŠTEKA, “Calculation of the numerical derivatives – comparison of the software”, Contrib. Geophys. Geod., vol. 35, no. 1, pp. 19–32, May 2021, Accessed: Mar. 30, 2026. [Online]. Available: https://journals.savba.sk/index.php/cgg/article/view/4942