Fisher, R.A. (1937) “The Wave of Advance of Advantageous Genes”, Annals of Eugenics7: 355-369.
2.
Kendall, D.G. (1965) “Mathematical Models of the Spread of Infection”, in Mathematics and Computer Science in Biology and Medicine. London: Medical Research Council.
3.
Ruhlen, M. (1987) A Guide to the Languages of the World. Stanford, CA: Stanford University Press.
4.
Skellam, J. (1973) “The Formulation and Interpretation of Mathematical Models of Diffusionary Processes in Population Biology”, in M. Bartlett and R. Hiorns (eds) The Mathematical Theory and Dynamics of Biological Populations. London: Academic Press.