@misc{indiciaea66597456f2e,
  title = {A simple extrasystole counter.},
  author = {R W Hille and L J Mykyta},
  year = {1969},
  doi = {10.5694/j.1326-5377.1969.tb107495.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4187849/},
  note = {Source identifier: 4187849}
}