Nagamani, H. N., and T. Bhavani Shanker. “On-Line Diagnosis of Power Transformer Insulation System: Experience of CPRI, India”. Power Research - A Journal of CPRI (March 3, 2012): 17–24. Accessed May 5, 2024. https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/657.