BennerP., ChuikoS., and NesmelovaO. “Least-Squares Method in the Theory of Nonlinear Boundary-Value Problems Unsolved With Respect to the Derivative”. Ukrains’kyi Matematychnyi Zhurnal 75, no. 1 (February 5, 2023): 38 - 51. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7408.