Amiruddin, Irfan N., and Edy S. Rusdy. “Optimal Portfolio Formation Using a Combination of Genetic Algorithms and Particle Swarm Optimization Based on Cluster Analysis”. Jurnal Matematika, Statistika Dan Komputasi, vol. 22, no. 3, May 2026, pp. 671-85, doi:10.20956/j.v22i3.50039.