1. "Testing," International Encyclopedia of Robotics;Lau Dagalakis,1988
2. Robot Performance Measurements Using Automatic Laser Tracking Techniques;Lau;Robotics and Computer-Integrated Manufacturing,1985
3. An Automatic Laser Tracking Interferometer System for Robot Metrology;Lau,1985
4. L.B. Brown, J. B. Merry and D. N. Wells, "Coordinate Measurement with a Tracking Laser Interferometer", Laser & Applications, Oct., 1986, pp. 69–71.
5. Laser Trilateration – a Fast, Accurate and Flexible Measuring Technique, Quality Today, May 1989. pp. 87 – 121.