@misc{indiciaeded608ff431d,
  title = {A sample volume tracking unit for pulsed Doppler echocardiography.},
  author = {J G Davis and K L Richards and D Greene},
  year = {1979},
  doi = {10.1109/tbme.1979.326404},
  url = {https://pubmed.ncbi.nlm.nih.gov/447358/},
  note = {Source identifier: 447358}
}