@misc{indiciae240733241d30,
  title = {Simple unit for temporary "on demand" pacing.},
  author = {S C Jordan and L M Clarke},
  year = {1969},
  doi = {10.1136/bmj.2.5654.442},
  url = {https://pubmed.ncbi.nlm.nih.gov/5781493/},
  note = {Source identifier: 5781493}
}