Gaurang C. Kanzariya, Utkarsh B. Solanki, and Miteshkumar J. Sathvara. “Islanding Detection Using Oscillation Frequency”. International Journal of Advance Research in Engineering, Science & Technology, vol. 4, no. 4, Apr. 2017, pp. 311-7, https://ijarest.org/index.php/ijarest/article/view/1076.