MELIALA, F. U.; SUKARNO, S. . Optimal Investment Portfolio Analysis Using The Markowitz Model For Stock In Each Sector In The Indonesia Stock Market During Covid 19 (2020-2021). Journal Research of Social Science, Economics, and Management, [S. l.], v. 2, n. 8, p. 1884 –, 2023. DOI: 10.59141/jrssem.v2i08.399. Disponível em: https://jrssem.publikasiindonesia.id/index.php/jrssem/article/view/399. Acesso em: 5 oct. 2024.