Waluyo, W., Sinisuka, N. I., Pakpahan, P. M., Suwarno, S., & Djauhari, M. A. (2013). Comparison of Eight Month Coastal Polluted Porcelain and Epoxy Resin Outdoor Insulators. Journal of Engineering and Technological Sciences, 40(2), 122-144. https://doi.org/10.5614/itbj.eng.sci.2008.40.2.4