Federal Reserve Bank of Chicago. Research Department and Federal Reserve Bank of Chicago. "An Examination of Change in Energy Dependence and Efficiency in the Six Largest Energy Using Countries - 1970-1988, Working Paper 1992-2" in Working Papers (Federal Reserve Bank of Chicago) (January 1992). https://fraser.stlouisfed.org/title/5285/item/575026, accessed on March 19, 2025.