Yuh-Shyan Hwang Jiann-Jong Chen Wen-Ta Lee High-order linear transformation MOSFET-C filters using operational transresistance amplifiers. 3275-3278 2005 conf/iscas/2005 ISCAS (4) https://doi.org/10.1109/ISCAS.2005.1465327 db/conf/iscas/iscas2005-4.html#HwangCL05