Pracyuk, B.B., YU.V. Prokopenko, K.G. Savin, and P.YU. Sergienko. “Tunable Microstrip Line Microwave Filters”. Electronics and Communications 16, no. 4 (March 31, 2011): 53–56. Accessed August 1, 2024. https://elc.kpi.ua/old/article/view/244662.