Nurhakim ES, Soma AM, Yunita I. Constructing Optimal Portfolios Using the Single Index Model and Markowitz Model: A Study on Cryptocurrencies. jasf [Internet]. 2024Dec.23 [cited 2025Jan.21];7(2):200-18. Available from: https://jasf.upnjatim.ac.id/index.php/jasf/article/view/485