Negara, I Nyoman Wijaya, Yohanes A.R. Langi, and Tohap Manurung. 2021. “Analisis Portofolio Saham Model Mean – Variance Markowitz Menggunakan Metode Lagrange”. d\’Cartesian: Jurnal Matematika Dan Aplikasi 9 (2):173-80. https://doi.org/10.35799/dc.9.2.2020.29656.