Yao, W. ., Y. . Wang, and T. . Itoh. “Envelope - Finite Element (EVFE) Technique in Electromagnetics With Perfectly Matched Layer (PML)”. Applied Computational Electromagnetics Society Journal (ACES), vol. 19, no. 1, June 2022, pp. 84-93, https://journals.riverpublishers.com/index.php/ACES/article/view/16651.