1. Ausubel, J. H., and Grübler, A., Working Less and Living Longer, Part 1: Long-Term Trends in Working Time and Time Budgets.
2. Carbon Dioxide Emissions in a Methane Economy;Ausubel;Climatic Change,1988
3. Energy in the 21st Century: From Resource to Environmental and Lifestyle Constraints;Grübler;Entropie,1991
4. The Dynamic Evolution of Methane Technologies;Grübler,1988
5. Dynamics Forces in Capitalist Development;Maddison,1991