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[1] Thompson M., Ellison L.R.S., Wood R., The international harmonized protocol for the proficiency testing of analytical chemistry laboratories, Pure Appl. Chem., 2006, Vol.78, No.1, 145-196
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[2] IAEA (International Atomic Energy Agency) Technical Reports Series No. 295, Measurements of Radionuclides in Food and Environment, Vienna, 1989
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[3] Canberra Industries GenieTM2000 Spectroscopy Software. Customization Tools Manual, Chapter 3: Genie Algorithms, 2006, 245-383
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[4] ISO (International Standardization Organization) 13528, Statistical methods for use in proficiency testing by interlaboratory comparisons, Geneva, 2005
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[5] Snedecor G.W., Cochran W.G., Statistical Methods, Eighth Edition, Iowa State University Press, 1989
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[6] Weiss N.A., Elementary statistics, Eighth Edition, Addison- Wesley, 1989
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[7] IAEA (International Atomic Energy Agency) Analytical Quality in Nuclear Applications Series No. 22 , Worldwide Open Proficiency Test: Determination of Natural and Artificial Radionuclides in Moss- Soil and Water, IAEA-CU- 2009-03, Vienna, 2012