@misc{indiciaef630dd36e795,
  title = {An analogue echogram range gate tracker for clinical echocardiography.},
  author = {M L Petrovick and G S Malindzak and E D Haak},
  year = {1979},
  doi = {10.1007/bf02225468},
  url = {https://pubmed.ncbi.nlm.nih.gov/548571/},
  note = {Source identifier: 548571}
}