Nguyen Quang Chung, Bui Thi Lan Anh, and Tran Thi Hai Ly. “THE RESULTS OF INTEGRAL OPERATION IN A RISK MODEL WITH EXCESS OF LOSS REINSURANCE”. UTEHY Journal of Applied Science and Technology, Vol. 36, Dec. 2022, pp. 84-88, http://jst.utehy.edu.vn/index.php/jst/article/view/577.