@misc{indiciae8e062622a0b2,
  title = {Addendum to article on 'visit-based sampling'.},
  author = {D S Shepard and R Neutra},
  year = {1979},
  doi = {10.2105/ajph.69.9.954},
  url = {https://pubmed.ncbi.nlm.nih.gov/474853/},
  note = {Source identifier: 474853}
}