Sun, W. Q., K. Xia, H. Y. Li, and C. M. Wang. “Power System Node Loadability Evaluation Using Flexibility Analysis Method”. Elektronika ir Elektrotechnika 20, no. 6 (June 9, 2014): 51-56. Accessed December 22, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/7267.