Pure Appl. Chem., 1993, Vol. 65, No. 9, pp. 2123-2144
doi: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)
M. Thompson and R. Wood