@misc{indiciae138b2686cbaa,
  title = {Fibers in human lung dust samples: a scanning electron microscope study.},
  author = {K H Friedrichs and H Otto},
  year = {1981},
  doi = {10.1080/15298668191419497},
  url = {https://pubmed.ncbi.nlm.nih.gov/7234680/},
  note = {Source identifier: 7234680}
}