MakarovV. L., MaykoN. V., and RyabichevV. L. “Realization of the Exact Three-Point Finite-Difference Schemes for the System of Second-Order Ordinary Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 75, no. 1, Feb. 2023, pp. 72 -95, doi:10.37863/umzh.v75i1.7373.