Theodoros T. Zygiridis, Nikolaos V. Kantartzis, and Theodoros D. Tsiboukis. “Four-Stage Split-Step 2D FDTD Method With Error-Cancellation Features”. Applied Computational Electromagnetics Society Journal (ACES), vol. 33, no. 02, July 2021, pp. 140-3, https://journals.riverpublishers.com/index.php/ACES/article/view/9251.