Smallpox and its eradication in Finland: implications for disease control.
Pitkänen
K J
KJ
Mielke
J H
JH
Jorde
L B
LB
D003140:Communicable Disease Control / Q000266:history*; D005387:Finland; D049711:History, Modern 1601-; D012899:Smallpox / Q000266:history*