1. L'économie demain;Hawken,1985
2. Telecommunications—Transportation Tradeoff: Options for Tomorrow;Nilles,1976
3. Possibilities for substitution between energy, time and information;Spreng;Energy Policy,1993
4. The substitution of information for energy in the system of production;Chen;ENER Bulletin,1992
5. Information and Energy: The Role of Information Mastery in the Connection between Economic Growth and Energy Consumption;Chen,1993