Rehiara, Adelhard Beni, et al. “An Adaptive PID Load Frequency Control of Islanded Microgrids Based on Iterative Learning Control”. International Journal of Integrated Engineering, vol. 17, no. 1, Apr. 2025, pp. 300-8, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/13787.