@misc{indiciae6c0a7276e1ff,
  title = {Digitizing two dimensional echocardiographical images.},
  author = {E van Ocken and V A Claes and D L Brutsaert},
  year = {1981},
  url = {https://pubmed.ncbi.nlm.nih.gov/6977969/},
  note = {Source identifier: 6977969}
}