Chen, M. ., R. S. . Chen, and X. Q. . Hu. “Augmented MLFMM for Analysis of Scattering from PEC Object With Fine Structures”. Applied Computational Electromagnetics Society Journal (ACES), vol. 26, no. 5, May 2022, pp. 418-2, https://journals.riverpublishers.com/index.php/ACES/article/view/15357.