Xu J- jun, Xu Y- chao, Yan L- mei, Zhao H- long, Sun Z- gang, Bai L- li, et al. Research on the method of optimal PMU placement. Int. J. Onl. Eng. [Internet]. 2013 Oct. 22 [cited 2024 Apr. 27];9(S7):pp. 24-29. Available from: https://online-journals.org/index.php/i-joe/article/view/3189