Pandiangan N, Sukono S, Hasbullah ES. Quadratic Investment Portfolio Based on Value-at-risk with Risk-Free Assets: For Stocks of the Mining and Energy Sector. IJEEP [Internet]. 2021 Jun. 8 [cited 2024 May 2];11(4):175-84. Available from: https://econjournals.com/index.php/ijeep/article/view/11165