Hany M. El-Maghrabi, Ahmed M. Attiya, Samir F. Mahmoud, Essam A. Hashish, and Mostafa El-Said. “Approximate Calculation of the Total Attenuation Rate of Propagating Wave Inside Curved Tunnel”. Applied Computational Electromagnetics Society Journal (ACES), vol. 31, no. 11, Aug. 2021, pp. 1265-70, https://journals.riverpublishers.com/index.php/ACES/article/view/9819.