Barry N. Taylor and Chris E. Kuyatt.
Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results.
Technical Report, NIST Tecnical Note 1297, 1994.

Bibtex:

@TechReport{ 	 taylor:1994:GEEU,
  author = 	 "Barry N. Taylor and Chris E. Kuyatt",
  title =        "Guidelines for Evaluating and Expressing the
                  Uncertainty of NIST Measurement Results",
  institution =  "NIST Tecnical Note 1297",
  year =  	 "1994",
}