Deeb Tubail, and Talal Skaik. “A DIRECT APPROACH FOR COUPLING MATRIX SYNTHESIS FOR COUPLED RESONATOR DIPLEXERS”. Journal of Microwaves, Optoelectronics and Electromagnetic Applications (JMOe), vol. 16, no. 4, Sept. 2019, pp. 942-53, doi:10.1590/2179-10742017v16i41077.