German standard methods for the examination of water, waste water and sludge; summary indices of actions and substances (group H); water hardness (H 6)— 4 стр.
Paper, board and pulps; standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples (ISO 187:1990); German version EN 20187:1993— 8 стр.
Precision of test methods - Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests; Identical with ISO 5725, edition 1986— 44 стр.