ZAHEER, K. B.; ABD AZIZ, M. I. B.; KASHIF, A. N.; RAZA, S. M. M. Two Stage Portfolio Selection and Optimization Model with the Hybrid Particle Swarm Optimization. MATEMATIKA: Malaysian Journal of Industrial and Applied Mathematics, [S. l.], v. 34, n. 1, p. 125–141, 2018. DOI: 10.11113/matematika.v34.n1.1001. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/1001. Acesso em: 28 sep. 2021.