1. Labelling as toxic at the initial notification stage of a new chemical;Chambers,1987
2. Directive 1999/45/EC of the European Parliament and of the Council of 31 May 1999 concerning the approximation of the laws, regulations and administrative provisions of the Member States relating to the classification, packaging and labelling of dangerous preparations. Off. J. Eur. Comm. L 200 [30.07.1999], 1–68.
3. OECD, 2001. Harmonised Integrated Classification System for Human Health and Environmental Hazards of Chemical Substances and Mixtures. OECD Series on Testing and Assessment, no. 33, ENV/JM/MONO(2001)6.
4. United Nations, 2001. United Nations Committee of Experts on the Transport of Dangerous Goods (UNCETDG). Working document ST/SG/AC.10/C.4/2001/3. Classification criteria for chemicals presenting physical hazards, Globally Harmonized System of Classification and Labelling of Chemicals (GHS). http://www.unece.org/trans/main/dgdb/dgsubc4/c4doc_2001.html