ANALYSIS OF OPTIMAL PORTFOLIO FORMATION USING SINGLE INDEX MODEL ON STOCKS INCLUDED IN THE LQ 45 MARKET INDEX ON THE INDONESIA STOCK EXCHANGE. AJAR [Internet]. 2022 Aug. 31 [cited 2025 Oct. 2];5(02):207-25. Available from: https://ojs.feb.uajm.ac.id/index.php/AJAR/article/view/345