1. International Organisation for Standardisation‘Quality assurance requirements for measuring equipment metrological confirmation system for measuring equipment’, ISO 10012 Part 1, 1992
2. International Organisation for Standardisation‘Quality assurance requirements for measuring equipment measurement process control’, ISO 10012 Part 2 (Draft), 1993
3. Wheeler, D.J., and Lyday, R.W.: ‘Evaluating the measurement process’, (SPC Press 1989)
4. Shewhart, W.A.: ‘Economic control of quality of manufactured product’, (D. Van Nostrand New York 1931)