@misc{indiciaeb4ad919bc4a7,
  title = {Initial clinical experience with a rate responsive pacemaker.},
  author = {I Singer and J Olash and A F Brennan and J Kupersmith},
  year = {1989},
  doi = {10.1111/j.1540-8159.1989.tb06150.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2476774/},
  note = {Source identifier: 2476774}
}