Amiruddin, I.N. and Rusdy, E.S. 2026. Optimal Portfolio Formation Using a Combination of Genetic Algorithms and Particle Swarm Optimization Based on Cluster Analysis. Jurnal Matematika, Statistika dan Komputasi. 22, 3 (May 2026), 671–685. DOI:https://doi.org/10.20956/j.v22i3.50039.