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3. R. U. Ayres, “Worlwide Transportation/Energy Demand Forecast: 1975–2000”, ORNL/Sub-78/13536 (October 1978).
4. R. U. Ayres, L. Ayres, P. Patterson, “Uncertain Transportation Energy Futures — U.S. Compared with other Regions of the World: 1970–2000”, The International Conference on Energy Use Management, Los Angeles (1979).
5. J. Hooker, “Some Problems of Definition raised by a Transportation Energy Data Base”, The International Conference on Energy Use Management, Los Angeles (1979).