Daniev , Yu. F., and I. A. Kushch. “Estimates of the Probability of the Random Process Stay in the Band ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 4 (April 17, 1992): 556–560. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/7898.