@misc{indiciaedef92065305b,
  title = {A universal biological interval timer.},
  author = {W M Caldwell},
  year = {1971},
  doi = {10.1109/tbme.1971.4502873},
  url = {https://pubmed.ncbi.nlm.nih.gov/5564374/},
  note = {Source identifier: 5564374}
}