@misc{indiciaeb06334a96e4f,
  title = {A simple timing waveform system for use with tape recorders and chart recorders.},
  author = {I R Perry and J Endresen},
  year = {1978},
  doi = {10.1007/bf02442667},
  url = {https://pubmed.ncbi.nlm.nih.gov/308595/},
  note = {Source identifier: 308595}
}