Awad, Ahmed, and Dawood Saleh. “Investigating the Impact of the Air Void Charges on the Surface Electric Field Distribution of the GIS Spacer”. Iraqi Journal for Electrical and Electronic Engineering 21, no. 2 (February 7, 2025): 173–185. Accessed December 29, 2025. https://ijeee.edu.iq/ijeee/article/view/595.