Segovia Vargas, Daniel and García Pérez, Oscar Alberto and González Posadas, Vicente and Aznar Ballesta, Francisco (2011). Dual-Band Tunable Recursive Active Filter. "IEEE, Microwave and Wireless Components Letters", v. 21 (n. 2); pp. 92-94. ISSN 1531-1309. https://doi.org/10.1109/LMWC.2010.2099649.