@misc{indiciae49634831f5d2,
  title = {Time as a factor in atmospheric sampling.},
  author = {R K Severs and R M Neal and T D Downs},
  year = {1977},
  doi = {10.1080/0002889778507925},
  url = {https://pubmed.ncbi.nlm.nih.gov/860687/},
  note = {Source identifier: 860687}
}