Samuel Sheet, Saad. “The Effect of Lightning Impulse and Switching (over Voltages) on Stress Distribution and Space Charge Accumulation of HVDC XLPE Cables at Load and No Load”. Al-Rafidain Engineering Journal (AREJ) 16, no. 3 (July 28, 2008): 50–61. Accessed August 7, 2025. https://ojs.uomosul.edu.iq/index.php/arej/article/view/27055.