AboElHamd, Eman, Mohamed Abdel-Basset, Hamed M. Shamma, Mohamed Saleh, and Ihab El-Khodary. “Modeling Customer Lifetime Value Under Uncertain Environment”. Neutrosophic Sets and Systems 39 (January 31, 2021): 10–30. Accessed April 25, 2025. https://fs.unm.edu/nss8/index.php/111/article/view/1212.