Astuti, Dian Widi, et al. “Studi Parameter Dualband Bandpass Filter Stub Loaded Square Open Loop Resonator”. InComTech : Jurnal Telekomunikasi Dan Komputer, vol. 7, no. 3, Feb. 2017, pp. 251-66, doi:10.22441/incomtech.v7i3.1171.