@misc{indiciae23f1490326f5,
  title = {A simple one channel 3 bit marking generator for polygraphs.},
  author = {I Krekule and J Valásek},
  year = {1967},
  url = {https://pubmed.ncbi.nlm.nih.gov/6058713/},
  note = {Source identifier: 6058713}
}