1. Fenner F, Henderson DA, Anita I, Jezele Z, Ladnyi ID: Smallpox and its eradication. Geneva: WHO, 1988;209–44, 335–46.
2.
2. Fenner F: Can smallpox return?World Health, Aug/Sept 1987;18–21.
3.
3. Ruffer MA, Ferguson AR: Note on an eruption resembling that of variola in the skin of a mummy of the twentieth dynasty (1200–1100 B.C.).J Pathol Bacteriol1911;15:1–3.
4.
4. Hopkins DR: Princes and Peasants. Smallpox in History.Chicago: University of Chicago Press, 1983.
5.
5. Cartwright FF: Prevention of smallpox. In: A Social History of Medicine.London: Longmans, 1977, 75–92.
6.
6. Jenner E: Further observations on the variolae vaccinate or cowpox. London1799. Reprinted in: Camac CNB, ed. Classics of Medicine and Surgery. New York: Dover, 1959;241–76.
