O. M. Iksanov, “On the rate of convergence of a regular martingale related to a branching random walk”, Ukr. Mat. Zhurn., vol. 58, no. 3, pp. 326–342, Mar. 2006, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3457