Mehta, D., P. Kundu, A. Chowdhury, and V. K. Lakhiani. “Preclusion of Partial Discharge from Transformer Insulation - a Design Perspective”. Power Research - A Journal of CPRI, June 2017, pp. 333-44, https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/123.