@misc{indiciae492762dacf64,
  title = {Heterograft aortic valve replacement.},
  author = {J K Clarebrough and M F O'Brien and J P Richardson},
  year = {1972},
  doi = {10.5694/j.1326-5377.1968.tb28760.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4673989/},
  note = {Source identifier: 4673989}
}