@misc{indiciaea24a21a1d842,
  title = {Tolerable pollution.},
  author = {R E Eckardt},
  year = {1971},
  doi = {10.1038/233149a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/16063250/},
  note = {Source identifier: 16063250}
}