1. Regulation (EC) No 842/2006 of The European Parliament and of the Council of 17 May 2006 on certain fluorinated greenhouse gases, 2006. Off. J. Eur. Union. Retrieved in December 2010 at: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2006:161:0001:0011:EN:PDF.
2. Directive 2006/40/EC of The European Parliament and of the Council of 17 May 2006 relating to emissions from air-conditioning systems in motor vehicles and amending Council Directive 70/156/EC, 2006. Off. J. Eur. Union. Retrieved in December 2010 at: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2006:161:0012:0018:EN:PDF.
3. EPA, A Proposed Rule for HFO-1234yf as an Automotive Refrigerant. Retrieved in December 2010 at: http://www.gpo.gov/fdsys/pkg/FR-2009-10-19/pdf/E9-25106.pdf.
4. EPA, Transitioning to low-GWP Alternatives in Unitary Air Conditioning, U.S. Environmental Protection Agency, U.S. Environmental Protection Agency, October 2010. Retrieved in December 2010 at: http://www.epa.gov/ozone/downloads/EPA_HFC_UAC.pdf.
5. D.P. Wilson, M. Koban, HFO-1234yf Industry Update, February 6, 2009. Retrieved in December 2010 at: http://www.epa.gov/cpd/mac/Final%20EPA%20HFO-1234yf%20Coml%20Mtg_2_6_09,%20Modified%20Version.pdf.