1. Hierarchy: Perspectives for Ecological Complexity;Allen,1982
2. Principles of the self-organizing system;Ashby,1962
3. Stability in time-varying ecosystems;Botkin;Am. Nat.,1975
4. Principles of ecosystem sustainability;Chapin;Am. Nat.,1996
5. Changing concepts of the balance of nature;Egerton;Quart. Rev. Biol.,1973