1. Smallpox and its eradication;Fenner,1988
2. Diagnosis and management of smallpox;Breman;N Engl J Med,2002
3. The global eradication of smallpox: final report of the Global Commission for the Certification of Smallpox Eradication,1980
4. Smallpox: the triumph over the most terrible of the ministers of death;Barquet;Ann Intern Med,1997
5. Princes and peasants: smallpox in history;Hopkins,1983