B. Bala Saibabu, Prasad Reddy Bhimavarapu. 2020. “Region of Stability for Single and Two Area Load Frequency Control Systems With Time Delay in the Parameter Space of PID Controllers Using Boundary Locus Method”. International Journal of Control and Automation 13 (4), 999 - 1009. http://sersc.org/journals/index.php/IJCA/article/view/19733.