Robust output feedback control of a magnetic levitation system via high-gain observer. - Zi-Jiang Yang; Seiichiro Hara; Shunshoku Kanae; Kiyoshi Wada (CDC, 2009)

An Adaptive Robust Nonlinear Motion Controller Combined With Disturbance Observer. - Zi-Jiang Yang; Seiichiro Hara; Shunshoku Kanae; Kiyoshi Wada; Chun-Yi Su (IEEE Trans. Control. Syst. Technol., 2010)

Robust Output Feedback Control of a Class of Nonlinear Systems Using a Disturbance Observer. - Zi-Jiang Yang; Seiichiro Hara; Shunshoku Kanae; Kiyoshi Wada (IEEE Trans. Control. Syst. Technol., 2011)