1. Chen, X., Yong, J., Wang, G., Paul, J. and Xu, G., Computing the minimum distance between a point and a NUBRS curve, Computer-Aided Design, Vol.40, No.8 (2008), pp.1051-1054.
2. Fang, F.Z., Zhang, X.D., Weckenmann, A., Zhang, G.X. and Evans, C., Manufacturing and measurement of freeform optics, CIRP Annals - Manufacturing Technology, Vol.62, No.2 (2013), pp.823-846.
3. ISO 1101:2012(E), Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form, orientation, location and run-out.
4. JIS B 0021:1998, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerancing of form, orientation, location and run-out (in Japanese).
5. Kadowaki, S., Data analysis and form evaluation for CMM, Journal of the Japan Society for Precision Engineering, Vo.61, No.8 (1995), pp.1069-1072 (in Japanese).