FRANSISCA, Diandra Chika. OPTIMISASI PORTOFOLIO SAHAM IDX30 DI ERA COVID-19 DENGAN MODEL MEAN-VARIANCE. STATMAT: Jurnal Statistika dan Matematika, [S. l.], v. 4, n. 1, p. 61–67, 2022. DOI: 10.32493/sm.v4i1.18980. Disponível em: https://openjournal.unpam.ac.id/index.php/sm/article/view/18980. Acesso em: 13 jan. 2026.