Somprom, S. ., S. . Khotama, and W. . Klongdee. “Maximizing the retention level for proportional reinsurance under  -regulation of the finite time surplus process with unit-equalized interarrival time”. Suan Sunandha Science and Technology Journal, vol. 3, no. 2, Nov. 2022, pp. 17-21, https://li02.tci-thaijo.org/index.php/ssstj/article/view/276.