USMAN, U. Comparison Analysis Of Optimal Portfolio With The Capital Asset Pricing Model (CAPM) Before And During The Covid-19 Pandemic : Study on Liquid-45 Index Stock Period 2018-2021. AJIRSS: Asian Journal of Innovative Research in Social Science, [S. l.], v. 1, n. 3, p. 89–97, 2022. DOI: 10.53866/ajirss.v1i3.157. Disponível em: https://www.das-institute.com/journal/index.php/ajirss/article/view/157. Acesso em: 21 apr. 2026.