TY  - RPRT
TI  - Herd immunity: history, theory, practice.
AU  - P E Fine
PY  - 1993
DO  - 10.1093/oxfordjournals.epirev.a036121
UR  - https://pubmed.ncbi.nlm.nih.gov/8174658/
ID  - 8174658
ER  -