Yezhov, I. I., Kadankov, V. F. and Kadankova, T. V. (2007) “Two-boundary problems for a random walk”, Ukrains’kyi Matematychnyi Zhurnal, 59(11), pp. 1485–1509. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3406 (Accessed: 5May2024).