@misc{indiciaead25383d3eff,
  title = {Difficult asthma.},
  author = {P J Barnes and A J Woolcock},
  year = {1998},
  doi = {10.1183/09031936.98.12051209},
  url = {https://pubmed.ncbi.nlm.nih.gov/9864023/},
  note = {Source identifier: 9864023}
}