Tangsnrat, W., P. Patthananurak, and W. lop Surakampontorn. “Low-Voltage Wide-Bandwidth CDBA and Its Application to Current-Mode Ladder Filters”. Engineering and Applied Science Research, vol. 32, no. 3, Nov. 2015, pp. 375-90, https://ph01.tci-thaijo.org/index.php/easr/article/view/42395.