Visitasari, Jatu, and Dodi Devianto. “PORTOFOLIO ENVELOPE PADA ASET FINANSIAL”. Jurnal Matematika UNAND 3, no. 2 (June 1, 2016): 80–87. Accessed November 5, 2026. https://jmua.fmipa.unand.ac.id/index.php/jmua/article/view/132.