GOST 8.531-1985 State system for ensuring the uniformity of measurements. Homogeneity of powdered certified reference materials of content. Measurement procedure
2002GOST 8.531-2002 State system for ensuring the uniformity of measurements. Reference materials of composition of solid and disperse materials. Ways of homogeneity assessment
1985GOST 8.531-1985 State system for ensuring the uniformity of measurements. Homogeneity of powdered certified reference materials of content. Measurement procedure