@misc{indiciae28f20d1a0a97,
  title = {The pacemaker challenge.},
  author = {B S Goldman and E J Noble and J G Heller and D Covvey},
  year = {1974},
  url = {https://pubmed.ncbi.nlm.nih.gov/4809444/},
  note = {Source identifier: 4809444}
}