Evaluation of a Low-cost MEMS Accelerometer for Distance Measurement. - Grantham Pang; Hugh Sing Liu (J. Intell. Robotic Syst., 2001)

LED location beacon system based on processing of digital images. - Grantham K. H. Pang; Hugh H. S. Liu (IEEE Trans. Intell. Transp. Syst., 2001)

Positioning beacon system using digital camera and LEDs. - Hugh Sing Liu; Grantham Pang (IEEE Trans. Veh. Technol., 2003)