A Realization of Multiple Circuit Transfer Functions Using OTA-C Integrator Loop Structure. - Takao Tsukutani; Masami Higashimura; Yasutomo Kinugasa; Yasuaki Sumi; Yutaka Fukui (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

Current-mode universal biquad circuit using MO-OTAs and DO-CCII. - Takao Tsukutani; Yasuaki Sumi; Masami Higashimura; Yutaka Fukui (ISCAS (2), 2005)