@misc{indiciae6e00f31b812e,
  title = {Variation of pollutant concentration with sampling time.},
  author = {J O Ledbetter},
  year = {1972},
  doi = {10.1080/00139307209435464},
  url = {https://pubmed.ncbi.nlm.nih.gov/5072267/},
  note = {Source identifier: 5072267}
}