@misc{indiciaea0d72006b25a,
  title = {Nongeometric Doppler stroke volume determination.},
  author = {D H Spodick and H Koito},
  year = {1989},
  doi = {10.1016/0002-9149(89)90067-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/2648790/},
  note = {Source identifier: 2648790}
}