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Airhart, M. and P. Mann (2007). "Location, Location, Location: Mapping the World’s Oil & Gas Giants." Retrieved January 12, 2015. IHS Energy Group provided pre-1980 data for the map, which is an ongoing collaborative effort between Mann, M.K. Horn, and IHS Vice President Ian Cross.
Höök, M., Hirsch, R., Aleklett, K., Giant oil field decline rates and their influence on world oil production, Energy Policy, 2009 [1]Archived July 26, 2011, at the Wayback Machine
Höök, M., Hirsch, R., Aleklett, K., Giant oil field decline rates and their influence on world oil production, Energy Policy, 2009 [1]Archived July 26, 2011, at the Wayback Machine