1. World Health Organization. Global Commission for the Certification of Smallpox Eradication. The achievement of global eradication of smallpox: final report of the Global Commission for the Certification of Smallpox Eradication, Geneva, December 1979. Geneva: WHO, 1979.
2. Vacated niches, competitive release and the community ecology of pathogen eradication
3. Factors affecting the likelihood of monkeypox's emergence and spread in the post-smallpox era
4. A human infection caused by monkeypox virus in Basankusu Territory, Democratic Republic of the Congo;Bull World Health Organ,1972
5. Multistate outbreak of monkeypox--Illinois, Indiana, and Wisconsin, 2003;Centers for Disease Control and Prevention (CDC;MMWR. Morb Mortal Wkly Rep,2003