KRISNA, K.; YUNITA, I. Portofolio Optimal di Masa Pandemi COVID-19 dengan Single Index Model. Jurnal ILMAN (Jurnal Ilmu Manajemen), [S. l.], v. 10, n. 2, p. 41-48, 2022. DOI: 10.35126/ilman.v10i2.13. Disponível em: https://journals.lppm-sukma.id/index.php/ilman/article/view/13. Acesso em: 29 apr. 2026.