TY  - RPRT
TI  - Impact of population density on immunization programmes.
AU  - I Arita
AU  - J Wickett
AU  - F Fenner
PY  - 1986
DO  - 10.1017/s0022172400066249
UR  - https://pubmed.ncbi.nlm.nih.gov/3734432/
ID  - 3734432
ER  -