Jayeola, Dare, Suliadi Sufahani, Zuhaimy Ismail, Wan Ahmad, Maria Nor, Muhaimin Ismoen, and Norafiz Maselan. 2018. “Optimal Risk Computation on Precious metal’s Assets Diversification”. International Journal of Engineering and Technology 7 (2): 526-28. https://doi.org/10.14419/ijet.v7i2.9858.