1. Aspects of tar sands development in Nigeria;Adewusi;Energy Sources,1992
2. Mathematical modeling of steam-assisted gravity drainage;Akin;SPE Reservoir Evaluation & Engineering,2005
3. Aleklett K., 2004. International Energy Agency accepts Peak Oil. ASPO website 〈http://www.peakoil.net/uhdsg/weo2004/TheUppsalaCode.html〉 (11/27/07).
4. Heavy oil—evermore mobile;Ali;Journal of Petroleum Science and Engineering,2003
5. World oil production capacity model suggests output peak by 2006–07;Bakhtiari;Oil and Gas Journal,2004