M. I. Ronto and T. V. Savina, “A numerical-analytic method for three-point boundary-value problems”, Ukr. Mat. Zhurn., vol. 46, no. 4, pp. 393–403, Apr. 1994, Accessed: Apr. 09, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5736