Castellares, Fredy, Silvio Patricio, and Artur Lemonte. “On Gamma-Gompertz-Makeham Assurances and Life Annuities”. Austrian Journal of Statistics 53, no. 4 (September 16, 2024): 1–24. Accessed February 14, 2025. https://ajs.or.at/index.php/ajs/article/view/1785.