Ogbogbo, C. P., I. U. Amadi, L. C. Nnoka, and T. Katsekpor. “Assessing Asset Value Changes Using a System of Stochastic Models With Constant Terms and Periodic Drift Coefficients”. International Journal of Mathematical Sciences and Optimization: Theory and Applications, Vol. 11, no. 2, Aug. 2025, pp. 93 - 102, https://ijmso.unilag.edu.ng/article/view/2708.