@misc{indiciae1d3a32afd8cb,
  title = {Concealed extrasystolic ventricular bigeminy with interpolation.},
  author = {P R Lightfoot},
  year = {1975},
  doi = {10.1378/chest.67.3.373},
  url = {https://pubmed.ncbi.nlm.nih.gov/46194/},
  note = {Source identifier: 46194}
}