Azis, Chusnul Chatimah, et al. “Optimizing the LQ45 Stock Portfolio Using Piecewise Linear Function: A Case Study from an Investor’s Point of View”. International Journal of Mathematics, Statistics, and Computing, vol. 2, no. 1, Feb. 2024, pp. 16-24, doi:10.46336/ijmsc.v2i1.61.