M. Li, X. D. Ye, F. Xu, and N. M. Luo. “Discontinuous Galerkin Finite Element Time Domain Method for Analysis of Ferrite Circulator With Non-Conforming Meshes”. Applied Computational Electromagnetics Society Journal (ACES), vol. 33, no. 12, July 2021, pp. 1346-51, https://journals.riverpublishers.com/index.php/ACES/article/view/8835.