@misc{indiciae415d41f358d5,
  title = {Acquired pulmonary stenosis.},
  author = {W A Littler and J B Meade and D I Hamilton},
  year = {1970},
  doi = {10.1136/thx.25.4.465},
  url = {https://pubmed.ncbi.nlm.nih.gov/5485008/},
  note = {Source identifier: 5485008}
}