General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2005); German and English version EN ISO/IEC 17025:2005, Corrigenda to DIN EN ISO/IEC 17025:2005-08; German and English version EN ISO/IEC 17025:2005/AC:2006— 4 стр.
Water quality - Guidance standard on the design and analysis of interlaboratory comparison studies for ecological assessment; German version prEN 16101:2010