1. Bracken K (2008) Reduced emission completions in DJ basin and natural buttes. Presentation given at EPA/GasSTAR Producers Technology Transfer Workshop. Rock Springs Wyoming, 1 May 2008.
http://www.epa.gov/gasstar/documents/workshops/2008-tech-transfer/rocksprings5.pdf
2. DOE/NETL (2010) Life cycle analysis: natural gas combined cycle (NGCC) power plant, DOE/NETL-403-110509, p127.
http://www.netl.doe.gov/energy-analyses/pubs/NGCC_LCA_Report_093010.pdf
3. Eckhardt M, Knowles B, Maker E, Stork P (2009) IHS U.S. Industry Highlights. (IHS) Houston, TX, Feb–Mar 2009.
http://www.gecionline.com/2009-prt-7-final-reviews
4. EIA AEO (2011) Annual energy outlook.
http://www.eia.gov/forecasts/aeo/pdf/0383(2011).pdf
5. MIT (2007) The future of coal, an interdisciplinary MIT study.
http://web.mit.edu/coal/The_Future_of_Coal.pdf