Yusuf, S. S., P. U. Okorie, A. S. Abubakar, I. O. Momoh, and F. Alhassan. “Enhancement of Voltage Stability With Unified Power Flow Controller Considering Loadability Analysis”. Journal of Engineering and Technology (JET), vol. 11, no. 2, Dec. 2020, pp. 55-71, https://jet.utem.edu.my/jet/article/view/5928.