@misc{indiciae081e6df8ae46,
  title = {An inexpensive chart-reading instrument.},
  author = {P J Lowe and C D Angenent},
  year = {1973},
  doi = {10.1007/bf02483701},
  url = {https://pubmed.ncbi.nlm.nih.gov/4729095/},
  note = {Source identifier: 4729095}
}