@misc{indiciae8b95646148d5,
  title = {The fetal circulation.},
  author = {A M Rudolph and M A Heymann},
  year = {1968},
  doi = {10.1146/annurev.me.19.020168.001211},
  url = {https://pubmed.ncbi.nlm.nih.gov/4871686/},
  note = {Source identifier: 4871686}
}