Waluyo, W. , Pakpahan, P. , Suwarno, S. , Djauhari, M. (2007). 'Study on Leakage Current Waveforms of Porcelain Insulator due to Various Artificial Pollutants'. World Academy of Science, Engineering and Technology, Open Science Index 8, International Journal of Electrical and Computer Engineering, 1(8), 1143 - 1148.