1. Hierarchy;Allen,1982
2. Social Entropy Theory;Bailey,1990
3. Adaptability: The Significance of Variability from Molecule to Ecosystem;Conrad,1983
4. Allocation, distribution, and scale: toward an economics that is efficient, just, and sustainable;Daly;Ecological Economics,1992
5. The Entropy Law and the Economic Process;Georgescu-Roegen,1971