@misc{indiciae79bfbc2f705d,
  title = {Lung changes in ankylosing spondylitis.},
  author = {A K Sil},
  year = {1972},
  doi = {10.1378/chest.61.4.406},
  url = {https://pubmed.ncbi.nlm.nih.gov/5020265/},
  note = {Source identifier: 5020265}
}