1. International Energy Agency (IEA). World Energy Investment Outlook;IEA:Paris, France, 2014; http://www.worldenergyoutlook.org(accessed Sept 2014).
2. Organization of the Petroleum Exporting Countries (OPEC). World Oil Outlook;OPEC:Vienna, Austria, 2013.
3. Clerici, A.; Assayag, M.World Energy Resources: 2013 Survey;World Energy Council:London, U.K., 2013.
4. Heavy Oils