@misc{indiciae0878e47c7b17,
  title = {Atmospheric aerosol background level.},
  author = {W H Fischer},
  year = {1971},
  doi = {10.1126/science.171.3973.828},
  url = {https://pubmed.ncbi.nlm.nih.gov/5541168/},
  note = {Source identifier: 5541168}
}