Issaranusorn, N., S. Rujivan, and K. Mekchay. “STOCHASTIC MODEL FOR GOLD PRICES AND ITS APPLICATION FOR NOARBITRAGE PRICING”. Journal of Nonlinear Analysis and Optimization: Theory & Applications 2, no. 1 (December 21, 2011): 11-17. Accessed December 6, 2021. http://www.math.sci.nu.ac.th/ojs302/index.php/jnao/article/view/16.