Limitations of a relaxation oscillator in capacitance measurements. - Yili Liu; Song Chen; Masakatsu Nakayama; Kenzo Watanabe (IEEE Trans. Instrum. Meas., 2000)

A high-sensitivity particle monitor using an integration sphere. - Kenzo Watanabe; Tomuo Yamaguchi; Masakatsu Nakayama; Yi-Zhu Gao; Tadashi Nagasawa; Taiyo Ozawa (IEEE Trans. Instrum. Meas., 2000)

A Nasicon CO2 gas sensor with drift-detection electrode. - Song Chen; De-Yin Jeng; Hironori Hadano; Yoshiaki Ishiguro; Masakatsu Nakayama; Kenzo Watanabe (IEEE Trans. Instrum. Meas., 2003)

The NDIR CO2 monitor with smart interface for global networking. - Yanfeng Wang; Masakatsu Nakayama; Mikiko Yagi; Makoto Nishikawa; Masaichi Fukunaga; Kenzo Watanabe (IEEE Trans. Instrum. Meas., 2005)