M. I. Ronto, A. M. Samoilenko, and S. I. Trofimchuk, “The theory of the numerical-analytic method: Achievements and new trends of development. II”, Ukr. Mat. Zhurn., vol. 50, no. 2, pp. 225–243, Feb. 1998, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4957