@misc{indiciaec37346c2cdf2,
  title = {[Device for ultrasonic cardiography using the Doppler effect].},
  author = {B E Mikhalev and O M Krynskiĭ},
  year = {1970},
  url = {https://pubmed.ncbi.nlm.nih.gov/5437173/},
  note = {Source identifier: 5437173}
}