@misc{indiciae12a46062ce59,
  title = {Epidemiologic surveillance in developing countries.},
  author = {R R Frerichs},
  year = {1991},
  doi = {10.1146/annurev.pu.12.050191.001353},
  url = {https://pubmed.ncbi.nlm.nih.gov/2049138/},
  note = {Source identifier: 2049138}
}