Srinu Babu, M., A. Shankar, and K. Seethalekshmi. “Power System Stability : Mode Identification in the Power System Oscillations Using Wide Area Measurement Systems”. Power Research - A Journal of CPRI, June 2015, pp. 247-58, https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/720.