1. A. Barker, memorandum to A. Wicks, Ometron, London, UK, 20 March 1991.
2. A. Barker, pers. comm. with M. Stafne, Virginia Polytechnic Institute and State University, Department of Mechanical Engineering, Blacksburg, VA, March 1997.
3. A. Barker, memorandum to A. Wicks, Ometron, London, UK, 20 March 1991.
4. X.W. Li, A precision laser scanning system for experimental modal analysis: Its test and calibration, M.S. Thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA, 1992, p. 88.
5. G100 and G300 Series Galvanometer Optical Scanners, Product Specification Sheet, General Scanning, Cambridge, MA, received 1997.