Kumar, S. ., and S. K. . Gupta. “Load Frequency Control of a Two-Area, Multi-Unit AGC Hybrid Power System Under Deregulated Environment Using PI-PDF and CPI-PDF Tuner With Differential Evolution Algorithm”. International Journal of Intelligent Systems and Applications in Engineering, vol. 12, no. 4s, Nov. 2023, pp. 16-29, https://ijisae.org/index.php/IJISAE/article/view/3748.