@misc{indiciae2986a8270b87,
  title = {Pacemaker refractory periods.},
  author = {S S Barold and J J Gaidula},
  year = {1971},
  doi = {10.1056/nejm197101282840423},
  url = {https://pubmed.ncbi.nlm.nih.gov/5539197/},
  note = {Source identifier: 5539197}
}