Jaikla, W., & Siripruchyanun, M. (2012). A Single-Output Digitally Programmable Current-Mode Universal Biquad Filter Using Current-controlled Current Conveyors (CCCII). Engineering and Applied Science Research, 34(2), 151–162. retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/1810