1. Commission of the European Communities. 1979. Approximation of the laws, regulations and administrative provisions relating to classification, packaging and labelling of dangerous substances, No. L259-110. Sixth Modification of Council Directive, 67/548/EEC Official Journal of the European Communities, October 15, 1979, Brussels, Belgium.
2. Commission of the European Communities. 1987. Approximation of the laws, regulations and administrative provisions relating to classification, packaging and labelling of dangerous substances. Sixth Modification of Council Directive, 67/548/EEC Official Journal of the European Communities, April 25, 1984, Brussels, Belgium.
3. Commission of the European Communities. 1987. Approximation of the laws, regulations and administrative provisions relating to classification, packaging and labelling of dangerous substances Level 1 test methods according to Annex VIII, Doc 79/831/EEC. Sixth Modification of Council Directive, 67/548/EEC. Official Journal of the European Communities, November 18, 1987, Brussels, Belgium.
4. Organization for Economic Cooperation and Development (OECD). 1981. OECD's guidelines for testing of chemicals Paris, France.
5. Organization for Economic Cooperation and Development (OECD). 1990. Ready biodegradability Draft OECD guideline for testing of chemicals Paris, France.