@misc{indiciae81948f443781,
  title = {Parasystole with fixed coupling.},
  author = {R Langendorf and A Pick},
  year = {1967},
  doi = {10.1161/01.cir.35.2.304},
  url = {https://pubmed.ncbi.nlm.nih.gov/6022800/},
  note = {Source identifier: 6022800}
}