1. Production of Halons to 1987;CEFIC,1987
2. Production of Halons 1211 and 1301 up to 1990;CEFIC,1991
3. 1988 Production and sales of chlorofluorocarbons 11 and 12, compiled by Grant-Thorton for Chemical Manufacturers Association;CMA,1989
4. The protection of the ozone layer, a view from China;Ding Kang Sheng,1990
5. Halocarbons in the stratosphere;Fabian;Nature,1981