Chen, J. ., Z. . Liu, B. . Yong, Z. . Jiang, and N. . Cao. “A Shifted SSOR Preconditioner With Low-Rank Compression for Monostatic RCS Calculation”. Applied Computational Electromagnetics Society Journal (ACES), vol. 28, no. 09, Sept. 2021, pp. 772-9, https://journals.riverpublishers.com/index.php/ACES/article/view/11425.