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 enumeration of phytoplankton using inverted microscopy (Utermцhl technique); German version EN 15204:2006— 60 стр.
German standard methods for the examination of water, waste water and sludge - General information (group A) - Part 45: Interlaboratory comparisons for proficiency testing of laboratories (A 45)— 31 стр.