DOI:
10.1055/s-00000148
Flugmedizin · Tropenmedizin · Reisemedizin - FTR
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References
Fenner F, Henderson DA, Arita I. et al
Smallpox and its eradication..
World Health Organization: Geneva 1988 Im Internet:
http://apps.who.int/iris/handle/10665/39485
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