@misc{indiciaebeb440645ef0,
  title = {The electronic pencil.},
  author = {I W Caldwell},
  year = {1972},
  doi = {10.1136/bmj.2.5813.591-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/5032794/},
  note = {Source identifier: 5032794}
}