1. R22 replacement status;Calm;ASHRAE J,2004
2. 2010 report of the refrigeration, air conditioning and heat pumps;UNEP Technical Options Committee,2011
3. Study on the concentration variation of HCFC-22 in the atmosphere;Sun;J Fudan Univ,2003
4. European emissions of halogenated greenhouse gases inferred from atmospheric measurements;Keller;Environ Sci Technol,2012
5. Combating climate change given big confidence boost in Canada, Governments agree to accelerated “freeze and phase-out” of ozone and climate damaging chemicals at Montreal Protocol's 20th anniversary celebrations;UNEP Ozone Secretariat,2007