@misc{indiciae7b7ce25fe860,
  title = {An inexpensive pulse source for obtaining elapsed time.},
  author = {P G Swingle},
  year = {1966},
  doi = {10.1901/jeab.1966.9-409},
  url = {https://pubmed.ncbi.nlm.nih.gov/5961509/},
  note = {Source identifier: 5961509}
}