QIN, Lang; WU, Xintao; XIAO, Fanjun; ZOU, Yunze. Analysis of the Energy Company Stock’s Portfolio in the Past Twenty Years by Using the Markowitz Model and the Index Model. BCP Business & Management, [S. l.], v. 30, p. 837–842, 2022. DOI: 10.54691/bcpbm.v30i.2574. Disponível em: https://bcpublication.org/index.php/BM/article/view/2574. Acesso em: 21 aug. 2026.