Norkin, B. V. “On the Solution of the Basic Integral Equation of Actuarial Mathematics by the Method of Successive Approximations”. Ukrains’kyi Matematychnyi Zhurnal 59, no. 12 (December 25, 2007): 1689–1698. Accessed March 29, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3422.