Luchka, A. Y., and T. D. Mamatov. “Solution of Volterra Integral Equations of the Second Kind With Small Nonlinearities by a Spline-Iteration Method”. Ukrains’kyi Matematychnyi Zhurnal 46, no. 4 (April 25, 1994): 433–437. Accessed December 15, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5742.