@misc{indiciae6d28d64dfb00,
  title = {A new apparatus for visual data sampling.},
  author = {R Williams},
  year = {1972},
  doi = {10.1068/p010359},
  url = {https://pubmed.ncbi.nlm.nih.gov/4680939/},
  note = {Source identifier: 4680939}
}