J. J. Oburu, R. Simwa, and N. Okelo, “Survival Analysis in Estimation of Attrition Rates among Policyholders in Jubilee and UAP Insurance Companies”, Int. J. Mod. Comput. Inf. Commun. Technol., vol. 3, no. 5 & 6, pp. 48–55, Jun. 2020, doi: 10.65000/aweg1c14.