@misc{indiciae4f96c1ebbadf,
  title = {Personal ear protection evaluation--present and future.},
  author = {P L Michael and D F Bolka},
  year = {1971},
  doi = {10.1080/0002889718506536},
  url = {https://pubmed.ncbi.nlm.nih.gov/5137932/},
  note = {Source identifier: 5137932}
}