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2. McNeill W. H., Plagues and Peoples (Blackwell, Oxford, 1976).
3. A Simple Model for Complex Dynamical Transitions in Epidemics
4. May R. M., in Biomathematics,, Hallam T., Levin S. A., Eds. (Springer-Verlag, Berlin, 1986), vol. 17, p. 405, 442.
5. U.K. Parliamentary Office of Science and Technology Note 131 (December 1999). See also parliament.uk/post/home.htm.