1. Manufacturing supplement on coordinate measuring machines,1991
2. Precision coordinate using a fibre optic touch probe;Butler,1990
3. Some aspects of error separation techniques in surface metrology;Whitehouse;J. Phys. E. Sci. Instrum.,1976
4. [4]C. Butler, G. Gregoriou, I. Shams, Mechatronics in Products and Manufacturing, Lancaster, UK.
5. Computer aided volumetric error calibration of coordinate measuring machines;Pahk,1990