Amin, S., M. A. Choudry, and S. Azam. “Degradation of Silicone Rubber Insulators under the Effects of Carbon Smoke, Salt and Cement Deposits”. The Nucleus, vol. 51, no. 4, Jan. 2015, pp. 425-9, http://202.83.167.189/index.php/Nucleus/article/view/670.