WAHYUNINGSIH, V. I.; MONTOLALU, C. E.; MANURUNG, T. Single Index Model in Forming the Optimal Portfolio Before and During the Covid-19 Pandemic on LQ-45 Shares. d\’Cartesian: Jurnal Matematika dan Aplikasi, [S. l.], v. 10, n. 1, p. 24–30, 2021. DOI: 10.35799/dc.10.1.2021.32979. Disponível em: https://ejournal.unsrat.ac.id/v3/index.php/decartesian/article/view/32979. Acesso em: 22 nov. 2024.