@misc{indiciae23e69556e717,
  title = {A procedure for concurrently measuring elapsed time and response frequency.},
  author = {R C Katz},
  year = {1973},
  doi = {10.1901/jaba.1973.6-719},
  url = {https://pubmed.ncbi.nlm.nih.gov/16795457/},
  note = {Source identifier: 16795457}
}