A general purpose observer architecture with application to failure detection and isolation. - Bahram Shafai; C. T. Pi; O. Bas; S. Nork; Stephen Paul Linder (ACC, 2001)

Simultaneous disturbance attenuation and fault detection using proportional integral observers. - Bahram Shafai; C. T. Pi; S. Nork (ACC, 2002)

Proportional integral adaptive observer for parameter and disturbance estimations. - Bahram Shafai; C. T. Pi; S. Nork; Stephen Paul Linder (CDC, 2002)