Implementation of an output feedback controller in operational space. - Qing Hua Xia; Ser Yong Lim; Marcelo H. Ang Jr.; Tao Ming Lim (IROS, 2003)

Adaptive Joint Friction Compensation using a Model-based Operational Space Velocity Observer. - Qing Hua Xia; Ser Yong Lim; Marcelo H. Ang Jr.; Tao Ming Lim (ICRA, 2004)

Adaptive Friction Compensation Using a Velocity Observer. - Qing Hua Xia; Ser Yong Lim; Marcelo H. Ang; Tao Ming Lim (ISER, 2004)

Robust observer-based controller and its application in robot control. - Qing Hua Xia; Ser Yong Lim; Marcelo H. Ang Jr.; Tao Ming Lim (IROS, 2005)

Parallel force and motion control using adaptive observer-controller. - Qing Hua Xia; Ser Yong Lim; Marcelo H. Ang; Tao Ming Lim (SMC, 2008)