@misc{indiciaec3119860cb01,
  title = {[Diacardiac phonography].},
  author = {P HEINTZEN and K W VIETOR},
  year = {1962},
  doi = {10.1007/bf01480443},
  url = {https://pubmed.ncbi.nlm.nih.gov/13906102/},
  note = {Source identifier: 13906102}
}