1. Resources to Reserves 2013
http://www.iea.org/etp/resourcestoreserves/
2. World Energy Investment Outlook
https://www.iea.org/newsroom/news/2014/november/world-energy-outlook-2014.html
3. A review on chemical flooding methods applied in enhanced oil recovery;Gurgel;Braz. J. Pet. Gas,2008
4. Improved oil recovery process for heavy oil: A review;Barillas;Braz. J. Pet. Gas,2008