Oktavianus Yusan, B. and Riyadi, S. 2024. Portfolio Optimization: Application and Comparison of Markowitz Model and Single Index Model on LQ45 Stocks in Indonesia Stock Exchange. International Journal of Management Science and Application. 3, 1 (Feb. 2024), 57–85. DOI:https://doi.org/10.58291/ijmsa.v3i1.210.