Pelekh Ya. M. “One Approach to the Determination of Approximate Solutions of the Cauchy Problem for Nonlinear Differential Equations ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 12 (December 4, 1992): 1695-1701. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8194.