@misc{indiciaedfe61e0f55c8,
  title = {Monitoring for ventricular premature beats.},
  author = {S Alexander and P J Singer and C L Feldman},
  year = {1978},
  doi = {10.1056/nejm197807202990317},
  url = {https://pubmed.ncbi.nlm.nih.gov/661880/},
  note = {Source identifier: 661880}
}