1. Allen, T.F.H. and Starr, T.B. (1982). Hierarchy: Perspectives for Ecological Complexity. Chicago: University of Chicago Press.
2. Allen, T.F.H. and Hoekstra, T.W. (1984). Nested and non-nested hierarchies: a significant distinction for ecological systems. In Proceedings of the Society for General Systems Research. I. Systems Methodologies and Isomorphics, ed. A.W. Smith, pp. 175–80. Lewiston, New York: Intersystems Publications, Coutts Library Service.
3. Anderson, M.C. (1964). Light relations of terrestrial plant communities and their measurement. Biological Reviews, 39, 425–86.
4. Bazzaz, F.A. (1979). The physiological ecology of plant succession. Annual Review of Ecology and Systematics, 10, 351–71.
5. Bolin, B., Döös, B.R., Warrick, R.A. and Jaeger, J. (1986). The Greenhouse Effect, Climatic Change, and Ecosystems. SCOPE 29. Chichester: John Wiley.