@misc{indiciaec2c7d293be78,
  title = {[Echocardiography].},
  author = {E Grube and D Koischwitz and H Simon and R Richter},
  year = {1978},
  url = {https://pubmed.ncbi.nlm.nih.gov/663773/},
  note = {Source identifier: 663773}
}