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2. Zoonotische Pockenviren;Essbauer;Bundesgesundheitsbl. - Gesundheitsforsch. - Gesundheitsschutz,2004
3. The Orthopoxviruses;Fenner,1988
4. Smallpox vaccination: a review, part I. Background, vaccination technique, normal vaccination and revaccination, and expected normal reactions;Fulginiti;Clin. Infect. Dis.,2003
5. Smallpox vaccination: a review, part II. Adverse events;Fulginiti;Clin. Infect. Dis.,2003