@misc{indiciaec929a3aa27ac,
  title = {Heart sounds after valve replacement.},
  author = {A A Luisada},
  year = {1967},
  doi = {10.1016/0002-9149(67)90098-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/4951356/},
  note = {Source identifier: 4951356}
}