Bakirova E, Iskakova N. An approach to the choice of the initial approximation of the solution of nonlinear boundary value problem for loaded differential equations. M [Internet]. 2016 Dec. 30 [cited 2025 Jul. 6];84(4):8-17. Available from: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/107