@misc{indiciae51845be2d60f,
  title = {Luftsichel sign upperlobe collapse.},
  author = {David Isbell and Daniel Grinnan and Manesh R Patel},
  year = {2002},
  doi = {10.1016/s0002-9343(02)01076-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/12034421/},
  note = {Source identifier: 12034421}
}