Khodier, M. . “Design and Optimization of Single, Dual, and Triple Band Transmission Line Matching Transformers for Frequency-Dependent Loads”. Applied Computational Electromagnetics Society Journal (ACES), vol. 24, no. 5, June 2022, pp. 446-52, https://journals.riverpublishers.com/index.php/ACES/article/view/15979.