Akpanibah, C. E., and U. O. Ini. “Refund Clause of Contributions With Predetermined Interest under CEV Model”. International Journal of Mathematical Sciences and Optimization: Theory and Applications 7, no. 1 (March 29, 2021): 1 - 16. Accessed June 21, 2025. https://ijmso.unilag.edu.ng/article/view/1207.