TY  - BOOK
AU  - Fenner, F., Henderson, D. A., Arita, I. & Jezek, Z.
TI  - Smallpox and its eradication
SN  - 92 4 156110 6
U1  - 614.521 Fen 
PY  - 1988///
CY  - World Health Organization, Geneva
ER  -