1. Stratospheric ozone is decreasing, Science, 239, 1489 (March 25, 1988).
2. (a) The changing atmosphere: implications for mankind, a C&EN special issue, Chemical & Engineering News, (November 24, 1986); (b) GFC production: DuPont seeks total phaseout, Chemical & Engineering News, 4–5 (April 4, 1988).
3. (b) GFC production: DuPont seeks total phaseout, Chemical & Engineering News, 4???5 (April 4, 1988).
4. Freon is a registered trademark of the DuPont Company. The chemical name for Freon TF is 1,1,2-trichlorotrifluoroethane (commonly known as CFC113); it belongs to the chemical family of chlorofluorocarbons (CFCs).
5. I. F. Stowers, Advances in cleaning metal and glass surfaces to micron-level cleanliness, J. Vac. Sci. Technol., 15, 751 (1978).