ANALISIS PEMBENTUKAN PORTOFOLIO SAHAM OPTIMAL SEKTOR PERTANIAN MENGGUNAKAN MODEL MARKOWITZ. JOURNAL OF SCIENCE AND SOCIAL RESEARCH, [S. l.], v. 9, n. 1, p. 1128–1135, 2026. DOI: 10.54314/jssr.v9i1.5794. Disponível em: https://jurnal.goretanpena.com/index.php/JSSR/article/view/5794.. Acesso em: 3 may. 2026.