Teixeira, F. L. . “A Summary Review on 25 Years of Progress and Future Challenges in FDTD and FETD Techniques”. Applied Computational Electromagnetics Society Journal (ACES), vol. 25, no. 1, June 2022, pp. 1-14, https://journals.riverpublishers.com/index.php/ACES/article/view/15547.