Yang, Yang, Xi Xi Xi Shi, and Xing Fang Fang Huang. “A Note on the Asymptotics for the Randomly Stopped Weighted Sums”. Nonlinear Analysis: Modelling and Control 23, no. 2 (April 12, 2018): 204–212. Accessed May 5, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/13320.