Single-input and three-output current-mode biquadratic filters using multiple-output OMAs. - Worapong Tangsrirat; Sumalee Unhavanich; Teerasilapa Dumawipata; Wanlop Surakampontorn (APCCAS (2), 2002)

Design of active-only highpass and bandpass leapfrog filters using multi-current-output differentiators. - Worapong Tangsrirat; Teerasilapa Dumawipata; Sumalee Unhavanich; Wanlop Surakampontorn (ICECS, 2003)

Current-mode Universal Filter with Four Inputs and One Output using CDTAs. - Teerasilapa Dumawipata; Worapong Tangsrirat; Wanlop Surakampontorn (APCCAS, 2006)