@misc{indiciaecf223d335e6d,
  title = {Reoperation for mitral stenosis.},
  author = {A Gray and A H Kitchin and A Logan and R W Turner},
  year = {1969},
  url = {https://pubmed.ncbi.nlm.nih.gov/5358175/},
  note = {Source identifier: 5358175}
}