Zahari, M., B. Ahmad, W. Peng Wen, N. A. Shairi, M. A. Mutalib, and N. Hassan. “An Investigation of Switchable Matched Bandstop to Bandpass Filter Based on Lossy Resonator”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 1-5, Apr. 2017, pp. 119-23, https://jtec.utem.edu.my/jtec/article/view/1848.