Król, M., and M. V. Kutniv. “Realization of Exact Three-Point Difference Schemes for Nonlinear Boundary-Value Problems on the Semiaxis”. Ukrains’kyi Matematychnyi Zhurnal, vol. 68, no. 12, Dec. 2016, pp. 1641-56, https://umj.imath.kiev.ua/index.php/umj/article/view/1950.