@misc{indiciae9689674c895e,
  title = {Doppler echocardiography--an overview.},
  author = {H D Allen and S J Goldberg and D J Sahn and L M Valdes-Crus},
  year = {1982},
  url = {https://pubmed.ncbi.nlm.nih.gov/7106983/},
  note = {Source identifier: 7106983}
}