GRASP/ Δ : An efficient algorithm for the multi-objective portfolio optimization problem - Estrada-Padilla, Alejandro; Gómez-Santillán, Claudia; Joaquín Fraire-Huacuja, Héctor; Cruz-Reyes, Laura; Rangel-Valdez, Nelson; Lucila Morales-Rodríguez, María; José Puga-Soberanes, Héctor (Expert systems with applications, 2023)