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2. K.A. McCully, J.G. Lee, Optimising Chemical Laboratory Performance through the Application of Quality Assurance Principles, in: F.M. Garfield, et al., Association of Official Analytical Chemists, Arlington, VA, USA, 1980, p. 73.
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4. Quality in the Analytical Laboratory;Crosby,1995
5. Proficiency Testing by Interlaboratory Comparisons—Development and Operation of Proficiency Testing Schemes, ISO Guide 43-1 and ISO Guide 43-2. International Organization for Standardization, Geneva, Switzerland, 1996.