@misc{indiciaec73f73af9d9f,
  title = {Air pollution research problems.},
  author = {S Calvert},
  year = {1971},
  doi = {10.1080/00022470.1971.10469585},
  url = {https://pubmed.ncbi.nlm.nih.gov/4106460/},
  note = {Source identifier: 4106460}
}