1. Montreal Protocol. 1991 Assessment. Report of the technology and economic assessment panel, United Nations Environment Panel, Nairobi, Kenya; December 1991.
2. Montreal protocol on substances that deplete the ozone layer, as adjusted and amended by the second meeting of the parties. United Nations Environment Programme, London; 27–29 June 1990.
3. Scientific assessment of ozone depletion 2007: World Meteorological Organization global research and monitoring project report no. 50. World Meteorological Organization, Geneva, Switzerland. 572p.
4. Rapid growth of hydrofluorocarbon 134a and hydrochlorofluorocarbons 141b, 142b, and 22 from advanced global atmospheric gases experiment (AGAGE) measurements;O’Doherty;J Geophys Res,2004
5. Accelerated increases observed for hydrochlorofluorocarbons since 2004;Montzka;Geophys Res Lett,2009