WASET
Thosdeekoraphat, T. , Summart, S. , Saetiaw, C. , Santalunai, S. , Thongsopa, C. (2012), 'Resistor-less Current-mode Universal Biquad Filter Using CCTAs and Grounded Capacitors', World Academy of Science, Engineering and Technology, Open Science Index 69, International Journal of Electronics and Communication Engineering, 6(9), 940 - 944.