1. ARAP web site. Alliance for Responsible Atmospheric Policy. .
2. Montreal protocol on substances that deplete the ozone layer;UNEP,1987
3. GECR. Kyoto protocol to the United Nations framework conservation on climate change. Global Environmental Change Report. New York, NY; 1997.
4. CFC phase out; have we met the challenge;Richard;J Fluorine Chem,2002
5. Global warming from HFC;Johnson;Environ Impact Assess Rev,1998