Sirait H, Hanifah WN, Anggraeni D, Christanti SA. Analysis of Optimal Stock Portfolio Formation Using the Single Index Model as the Basis for Investment Decisions. Eduvest [Internet]. 2024Dec.24 [cited 2025Jun.30];4(12):11560-78. Available from: https://eduvest.greenvest.co.id/index.php/edv/article/view/1805