@misc{indiciae38a103050a57,
  title = {A useful portable timer.},
  author = {R M Foxx and P L Martin},
  year = {1971},
  doi = {10.1901/jaba.1971.4-60},
  url = {https://pubmed.ncbi.nlm.nih.gov/16795280/},
  note = {Source identifier: 16795280}
}