Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method (ISO 5725-2:1994 including Technical Corrigendum 1:2002)— 97 стр.
Fertilizers - Extraction of total calcium, total magnesium, total sodium and total sulfur in the forms of sulfates; German version EN 15960:2011— 8 стр.
