Casella G, Berger RL. Statistical Inference. 2nd ed.
Duxbury Thomson Learning, 2002, Pages 240-245
Joint Commitee for Guides in Metrology. Evaluation of measurement data-
Guide to the expression of uncertainty in measurement. 2008.
Joint Commitee for Guides in Metrology. International Vocabulary of Metrology (VIM)-
Basic and General Concepts and Associated Terms. 2012.