Kotian, Shashidhara M., Sreenadh Batchu, and Shubhanga K. N. 2013. “Sub-Synchronous Resonance through Torsional Mode Interactions: An Analysis”. Power Research - A Journal of CPRI 9 (1):89–96. https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/340.