Chinwenyi, H. C., E. S. Onah, and T. Aboiyar. 2018. “Partial Differential Equation Approach for Valuation of European Put Option Price Using Two Stochastic Financial Models.”. International Journal of Mathematical Sciences and Optimization: Theory and Applications 2018 (June), 276 -90. http://ijmso.unilag.edu.ng/article/view/40.