Saputra, Moch Panji Agung, et al. “Investment Portfolio Optimization Using Mean-Semi Standard Deviation Model (Case Study: BBNI, BBCA, BMRI, TLKM, and ANTM)”. Operations Research: International Conference Series, vol. 5, no. 4, Jan. 2025, pp. 146-54, doi:10.47194/orics.v5i4.353.