Wan Abdul Razak, Intan Azmira, et al. “A Hybrid Method of Least Square Support Vector Machine and Bacterial Foraging Optimization Algorithm for Medium Term Electricity Price Forecasting”. International Journal of Integrated Engineering, vol. 11, no. 3, Sept. 2019, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/4689.