Dimitropoulou, M., D. Pylarinos, K. Siderakis, E. Thalassinakis, and M. Danikas. “Comparative Investigation of Pollution Accumulation and Natural Cleaning for Different HV Insulators”. Engineering, Technology & Applied Science Research 5, no. 2 (April 20, 2015): 764–774. Accessed September 18, 2021. https://etasr.com/index.php/ETASR/article/view/545.