Smallpox and epidemiological-demographic change in Europe: the role of vaccination.
Mercer
A J
AJ
D000486:Allergy and Immunology / Q000266:history*; D003710:Demography; D005060:Europe; D049711:History, Modern 1601-; D012899:Smallpox / Q000266:history*; D013223:Statistics as Topic / Q000266:history*