TY  - RPRT
TI  - Immunisation and herd immunity.
AU  - R M Anderson
AU  - R M May
PY  - 1990
DO  - 10.1016/0140-6736(90)90420-a
UR  - https://pubmed.ncbi.nlm.nih.gov/1969023/
ID  - 1969023
ER  -