@misc{indiciae100bcdc23935,
  title = {Fixed and variable coupling of ventricular extrasystoles.},
  author = {S Talbot},
  year = {1973},
  doi = {10.1159/000169624},
  url = {https://pubmed.ncbi.nlm.nih.gov/4127295/},
  note = {Source identifier: 4127295}
}