He, Zi. “A Parallel Two-Level Spectral Preconditioner for Fast Monostatic Radar Cross-Section Calculation”. Applied Computational Electromagnetics Society Journal (ACES) 29, no. 08 (September 3, 2021): 669–676. Accessed November 1, 2024. https://journals.riverpublishers.com/index.php/ACES/article/view/10939.