@misc{indiciae74146fb9e5e0,
  title = {Emphysema in coalworkers.},
  author = {M C Kennedy},
  year = {1970},
  doi = {10.1136/bmj.4.5727.115-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/5471759/},
  note = {Source identifier: 5471759}
}