Barzanti, Luca, and Corrado Corradi. “On the Computation of Upper Approximations to Ultimate Ruin Probabilities in Case of DFR Claimsize Distributions”. Statistica 65, no. 2 (January 1, 2005): 219–225. Accessed April 3, 2025. https://rivista-statistica.unibo.it/article/view/1233.