@misc{indiciae31469e634565,
  title = {Retrosternal density: pulmonary underdevelopment or accessory hemidiaphragm.},
  author = {N S Sid and L T Shearer and E K Gultekin},
  year = {1991},
  doi = {10.1002/ppul.1950110216},
  url = {https://pubmed.ncbi.nlm.nih.gov/1758736/},
  note = {Source identifier: 1758736}
}