TY  - RPRT
TI  - Smallpox and its post-eradication surveillance.
AU  - Z Jezek
AU  - L N Khodakevich
AU  - J F Wickett
PY  - 1987
UR  - https://pubmed.ncbi.nlm.nih.gov/3319266/
ID  - 3319266
ER  -