Solodky S. G., and StasyukS. A. “On Optimization of Numerical Differentiation Methods for Bivariate Functions”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 2 (February 21, 2022): 253 - 273. Accessed December 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/6906.