@misc{indiciae567a90d31df0,
  title = {Implantable demand pacemaker.},
  author = {A Castellanos and L Lemberg and J R Jude and K Mobin-Uddin and B V Berkovits},
  year = {1968},
  doi = {10.1136/hrt.30.1.29},
  url = {https://pubmed.ncbi.nlm.nih.gov/5637553/},
  note = {Source identifier: 5637553}
}