@misc{indiciae56593ff18c5a,
  title = {Emphysema in coalworkers.},
  author = {W R Parkes and R G Williamson and T J Phillips},
  year = {1970},
  doi = {10.1136/bmj.4.5732.430-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/5481525/},
  note = {Source identifier: 5481525}
}