Ridho Jatmiko Utama, Bekman Siagian. OPTIMAL STOCK PORTFOLIO USING SINGLE INDEX MODEL (Case Study: 50 Biggest Market Capitalization listed on the Indonesia Stock Exchange for the Period January 2023 – December 2023). IJEBAS [Internet]. 2025 Feb. 25 [cited 2025 Mar. 6];5(1):327-42. Available from: http://radjapublika.com/index.php/IJEBAS/article/view/2490