@misc{indiciae3db8ee07f720,
  title = {The normal ballistocardiogram.},
  author = {L BROTMACHER},
  year = {1956},
  doi = {10.1136/hrt.18.2.145},
  url = {https://pubmed.ncbi.nlm.nih.gov/13315844/},
  note = {Source identifier: 13315844}
}