Team, S. “Portfolio Optimization of Energy Commodity Futures Returns With Minimum Information Copula: Payap Tarkhamtham, Jirakom Sirisrisakulchai, Roengchai Tansuchat”. Thai Journal of Mathematics, Oct. 2017, pp. 197-13, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/656.