@misc{indiciaea6f442364b42,
  title = {An optoelectronic slide identifier.},
  author = {P F Heard and A P Makepeace},
  year = {1977},
  doi = {10.1068/p060727},
  url = {https://pubmed.ncbi.nlm.nih.gov/74822/},
  note = {Source identifier: 74822}
}