Farhat, Sedig S. “Application of Finite Difference Time Domain (FDTD) Method to Calculate Poynting Vector of EM Waves in Free Space”. The Libyan Journal of Science 20, no. 1 (February 5, 2022): 43–54. Accessed April 19, 2026. https://journals.uot.edu.ly/index.php/ljs/article/view/171.