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Djoumessi, E. E., Chaker, M., & Wu, K. (2009, January). Varactor-tuned dual-mode bandpass filter for wireless applications [Paper]. IEEE Radio and Wireless Symposium (RWS 2009), San Diego, California. External link
Djoumessi, E. E., Chaker, M., & Wu, K. (2009). Varactor-tuned quarter-wavelength dual-bandpass filter. IET Microwaves, Antennas & Propagation, 3(1), 117-124. External link