Asih I Maruddani, Di, and Trimono Trimono. 2021. “Valuation of Portfolio Risk and Performance of Several Blue Chip Stocks in Indonesia Using Value-at-Risk Based on N-Dimensional Geometric Brownian Motion”. Thailand Statistician 19 (3):501-10. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/244528.