1. Commission Directive 93/21/EEC of 27 April, 1993, adapting to technical progress for the 18th time Council directive 67/548/EEC on the approximation of the laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances, Off. J. of the E. C., L110 (1993).
2. Council Directive of 7 June, 1988, on the approximation of the laws, regulations and administrative provisions of the Member States relating to the classification, packaging and labelling of dangerous preparations (88/379/EEC), Off. J. of the E. C., L187 (1988).
3. Evaluation pattern of the Kommission Bewertung wassergefährdender Stoffe (KBwS, Commission for the Evaluation of Substances Hazardous to Waters) for the Classification of Substances in Water Hazard Classes within the meaning of Article 19g of the Federal Water Act, Umweltbundesamt, Berlin, 1997.
4. Swedish Standard for Environmentally Acceptable Hydraulic oils, SS 15 54 34.
5. RAL-UZ 79 ‘Rapidly biodegradable hydraulic fluids’, Umweltbundesamt, Berlin, 1995.