@misc{indiciae5283775e675f,
  title = {Chronic frontal sinusitis treated by autogenous osteoplasty.},
  author = {B Grahne},
  year = {1971},
  doi = {10.3109/00016487109122475},
  url = {https://pubmed.ncbi.nlm.nih.gov/4939713/},
  note = {Source identifier: 4939713}
}