BennerP., ChuikoS. and NesmelovaO. 2023. Least-squares method in the theory of nonlinear boundary-value problems unsolved with respect to the derivative. Ukrains’kyi Matematychnyi Zhurnal. 75, 1 (Feb. 2023), 38 - 51. DOI:https://doi.org/10.37863/umzh.v75i1.7408.