1. Guide to Expressions of Uncertainty in Measurement––GUM, ISO Publishing, 1995
2. L. Wisweh, M. Sandau, Quality evaluation of measurement instruments, in: M.N. Durakbasa, et al. (Ed.), Proceedings of the XVI IMEKO World Congress, Vienna, Austria. 2000, vol. VIII, pp. 473–482
3. Fundamental concepts of measurement;Finkelstein;Measurement,2003
4. Widely, strongly and weekly defined measurement;Finkelstein;Measurement,2003
5. Uncertainty and sampling;Wunderli;Accreditation and Quality Assurance,2003