MULYANINGTYAS, Enggal Dwi; ROKHIM, Rofikoh. Evaluation of individual stock portfolio performance on the Indonesia stock exchange using the Ortiz, Jorion, and Markowitz approaches. Economic Military and Geographically Business Review, [S. l.], v. 4, n. 1, 2026. DOI: 10.61511/emagrap.v4i1.2026.3789. Disponível em: https://journal-iasssf.com/index.php/EMAGRAP/article/view/3789. Acesso em: 28 jul. 2026.