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World Health Organization. Smallpox Eradication Unit ,  [Places visited and persons examined in preparation for and during visits by international commissions for the certification of smallpox eradication / Smallpox Eradication Unit, WHO, HQ]

World Health Organization. Smallpox Eradication Unit ,  [Methodology for preparation of appropriate data for the 31 countries remaining to be certified free of smallpox]

World Health Organization. Smallpox Eradication Unit ,  [Places visited and persons examined in preparation for and during visits by international commissions for the certification of smallpox eradication / Smallpox Eradication Unit, WHO, HQ]

World Health Organization. Smallpox Eradication Unit ,  [Methodology for preparation of appropriate data for the 31 countries remaining to be certified free of smallpox]