Geographic information - Classification systems - Part 1: Classification system structure (ISO 19144-1:2009); English version EN ISO 19144-1:2012— 42 стр.
German standard methods for the examination of water, waste water and sludge - Jointly determinable substances (group F) - Part 44: Determination of selected heterocyclic aromatic hydrocarbons (NSO heterocycles) in water - Method using gas chromatography and mass spectrometry (GC/MS) after solid-phase extraction (SPE) (F 44)— 38 стр.