RontoM. I., SamoilenkoA. M., and TrofimchukS. I. “The Theory of the Numerical-Analytic Method: Achievements and New Trends of Development. II”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 2 (February 25, 1998): 225–243. Accessed September 1, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4957.