Bingxin, L. ., and Z. . Baorong. “Space-Frequency Domain Iterative Method for Modes Analysis of Planar Waveguides”. Applied Computational Electromagnetics Society Journal (ACES), vol. 30, no. 08, Aug. 2021, pp. 819-23, https://journals.riverpublishers.com/index.php/ACES/article/view/10419.