Pure Appl. Chem., 1993, Vol. 65, No. 9, pp. 2123-2144
http://dx.doi.org/10.1351/pac199365092123
INTERDIVISIONAL WORKING PARTY FOR HARMONIZATION OF QUALITY ASSURANCE SCHEMES FOR ANALYTICAL LABORATORIES
The international harmonized protocol for the proficiency testing of (chemical) analytical laboratories (Technical Report)
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