TY  - RPRT
TI  - [Sampling and representativeness in epidemiological surveillance using sentinel sites]
AU  - J Samaja
PY  - 1996
DO  - 10.1590/s0102-311x1996000300004
UR  - https://pubmed.ncbi.nlm.nih.gov/10904333/
ID  - 10904333
ER  -