A. Hussein, Arkan, Yaroub G. Jasim, and Sabah S. Salih. 2011. “Effect of Industrial Pollution on Different Types of High Voltage Insulators”. Journal of Engineering and Sustainable Development 15 (1): 108-17. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1354.