Willie, Michael Mncedisi. “Extremal Application of Underwriting Instruments in South African Medical Schemes, 2015–2024: A Peaks-Over-Threshold Analysis With Policy Implications”. Indonesian Journal of Health Insurance and Medical Records (IJHIMR) 3, no. 2 (October 25, 2026): 304–313. Accessed October 25, 2026. https://trial-ojs.poltekkes-malang.ac.id/ijhimr/article/view/6672.