1. EA-10/10, 1999, EA Guidelines on the Determination of Pitch Diameter of Parallel Thread Gauges by Mechanical Probing, European cooperation for Accreditation.
2. Kunzmann H., Lerch J. & Waeldele F. 1980, Messen von Gewinden auf Rechnergesteuerten Koordinatenmessgeraeten, PTB Mlttellungen, 90 6/80, p. 434-441.
3. Masalar L. 2000, What the new thread calibration by scanning Instrument brings in comparison to the classical methods, NCSL Workshop & Symposium.
4. ISO 68-1: 1996, ISO general purpose screw threads - Basic profile - Part 1: Metric screw threads.
5. ISO 540B: 1993, Cylindrical screw threads -Vocabulary.