Maulidi, Ikhsan, et al. “Optimal Bonus-Malus Premium With the Claim Frequency Distribution Is Negative Binomial and the Claim Severity Distribution Is Truncated Weibull”. Jurnal Matematika UNAND, vol. 15, no. 2, Apr. 2026, pp. 179-95, doi:10.25077/jmua.15.2.179-195.2026.