1. Smallpox and its eradication;Fenner,1988
2. The invisible fire;Shurkin,1979
3. Vaccine development: necessity as the mother of invention;Burnette;New Biologist,1992
4. The adoption of inoculation for smallpox in England;Miller,1957
5. Small pox prevention during the Ming Dynasty;Hes;Koroth 6,1972