@misc{indiciae85374055e1f4,
  title = {Implanted cardiac pacemakers of variable frequency.},
  author = {G J HAUPT and R N MYERS and J W DALY and N C BIRKHEAD},
  year = {1963},
  doi = {10.1001/jama.1963.03060020047020},
  url = {https://pubmed.ncbi.nlm.nih.gov/13961005/},
  note = {Source identifier: 13961005}
}