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2. A. J. Duncan, Quality Control and Industrial Statistics, 5th Edition, Irwin, Illinois, 1986.
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4. GUM, 1993] Guide to the Expression of Uncertainty in Measurement,International Organization for Standardization, Geneva, 1993.
5. ISO7870, 1993] ISO 7870:1993 Control charts — General guide and introduction,International Organization for Standardization, Geneva.