Bagus Yosia Wiryakusuma IG. Analysis of Optimal Portfolio Performance Comparison on Companies Listed in LQ45 Index and Companies Unregistered in LQ45 Index. KSS [Internet]. 2020 Feb. 6 [cited 2025 Oct. 28];4(3):250–261. Available from: https://knepublishing.com/index.php/KnE-Social/article/view/6410