TY  - RPRT
TI  - [A sampling plan for evaluation of vaccinal coverage].
AU  - E P Silva
AU  - N Nakao
AU  - E Juarez
PY  - 1989
DO  - 10.1590/s0034-89101989000200009
UR  - https://pubmed.ncbi.nlm.nih.gov/2617107/
ID  - 2617107
ER  -