@misc{indiciae1b72ac69eee0,
  title = {On-line digitizing: a basic system.},
  author = {D J Birnie},
  year = {1980},
  doi = {10.1179/bjo.7.2.81},
  url = {https://pubmed.ncbi.nlm.nih.gov/6932970/},
  note = {Source identifier: 6932970}
}