Water quality - Determination of parathion, parathion-methyl and some other organophosphorus compounds in water by dichloromethane extraction and gas chromatographic analysis; German version EN 12918:1999— 32 стр.
German standard methods for the examination of water, waste water and sludge - General information (group A) - Part 11: Sampling of waste water (A 11)— 15 стр.
German standard methods for the examination of water, waste water and sludge; general information (group A); sampling of untreated water and drinking water (A 14)— 11 стр.