Quang Phung Duy, Thinh Nguyen Huu, Chien Doan Quyet,Nhat Nguyen Hong, “UPPER BOUNDS FOR RUIN PROBABILITY IN A CONTROLLED GENERAL RISK PROCESS WITH RATE OF INTEREST IS A FIRST - ORDER”, TURCOMAT, vol. 12, no. 14, pp. 1070–1077, Aug. 2021.