San-Blas, Ángel A. ., and J. M. . Roca. “Highly Efficient Technique for the Full-Wave Analysis of Circular Waveguide Filters Including Off-Centered Irises”. The Applied Computational Electromagnetics Society Journal (ACES), vol. 30, no. 11, Aug. 2021, pp. 1232-40, https://journals.riverpublishers.com/index.php/ACES/article/view/10347.