1. Socialism and the unity of physical forces;Podolinsky;Organization & Environment,2004
2. Wealth, virtual wealth and debt;Soddy,1926
3. From technocracy to net energy analysis: engineers, economists, and recurring energy theories of value;Berndt,1983
4. Net energy from the extraction of oil and gas in the United States;Cleveland;Energy,2005
5. The Entropy Law and the Economic Process;Georgescu-Roegen,1971