1. Akaike H. 1973. Information theory and an extension of the maximum likelihood principle. In: Petrov B.N. and Csaki F. (eds), 2nd International Symposium on Information Theory. Akademiai Kiado, Budapest, pp. 267–281.
2. Akçakaya H.R., Ginzburg L.R., Slice D. and Slobodkin L.B. 1988. The theory of population dynamics—II: physiological delays. Bulletin of Mathematical Biology 50: 503–515.
3. Boyce W.E. and DiPrima R.C. 1986. Elementary Differential Equations and Boundary Value Problems. 4th edn. John Wiley, New York.
4. Cartwright N. 1999. The Dappled World: A Study of the Boundaries of Science. Cambridge University Press, Cambridge.
5. Clark G.P. 1971. The second derivative in population modelling. Ecology 52: 606–613.