Yi, Tao, Cheng-Min Wang, Wei-Qing Sun, and Yan Zhang. “Research of Power System Closest Voltage Collapse Boundary”. Elektronika ir Elektrotechnika 19, no. 10 (December 10, 2013): 33-36. Accessed April 27, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/5890.