Boutejdar, A. ., N. M. . Eltabit, A. A. . Ibrahim, E. P. . Burte, and M. A. . Abdalla. “New Compact Dual Bandpass Filter Using Coupled Double-Ring Resonators and DGS-Technique”. Applied Computational Electromagnetics Society Journal (ACES), vol. 31, no. 02, Aug. 2021, pp. 132-7, https://journals.riverpublishers.com/index.php/ACES/article/view/10227.