CALDIÑO, Eneas A. On the mean-standard deviation frontier. Estudios Económicos de El Colegio de México, [S. l.], v. 11, n. 2, p. 297–319, 1996. DOI: 10.24201/ee.v11i2.253. Disponível em: https://estudioseconomicos.colmex.mx/index.php/economicos/article/view/253. Acesso em: 29 apr. 2025.