1. Austin, M. and B. Cook. 1974. Ecosystem stability: a result from an abstract analysis. J. Theor. Biol. 45: 435–458.
2. Fraser, R., W. Duncan and A. Collar. 1957. Elementary matrices. Cambridge University Press, Cambridge.
3. Huang, H. and H. Morowitz. 1972. A method for phenomenological analysis of ecological data. J. Theor. Biol. 35: 389.
4. Lasalle, J. and S. Lefshetz. 1961. Stability by Liapunov’s direct method. Academic Press.
5. May, R., 1973. Stability and complexity in model ecosystems. Princeton University Press, Princeton, N.J.