1. A note on the energy intensity of developing countries;Goldemberg;Energy Policy,1996
2. International price and quantity comparisons;Heston;American Economic Review,1996
3. Heston, A., Summers, R., 1997. PPPs and price parities in benchmark studies and the Penn world table: uses. Paper presented to Eurostat's Conference on the Value of Real Exchange Rates, Brussels.
4. IEA, 1994. Energy in Developing Countries — A Sectoral Analysis. International Energy Agency. Organisation for Economic Co-operation and Development, Paris.
5. US Department of Commerce, 1998. Survey of Current Business (July). Bureau of Economic Analysis, p. D-36.