@misc{indiciaeb230bbe9fe45,
  title = {An instrument for one- or two-dimensional tracking.},
  author = {W C Roehrig},
  year = {1965},
  doi = {10.2466/pms.1965.21.1.307},
  url = {https://pubmed.ncbi.nlm.nih.gov/5828398/},
  note = {Source identifier: 5828398}
}