@misc{indiciae09019de89dac,
  title = {Diffusive sampling.},
  author = {R H Brown and K J Saunders},
  year = {1987},
  doi = {10.1093/annhyg/31.1.105},
  url = {https://pubmed.ncbi.nlm.nih.gov/3592459/},
  note = {Source identifier: 3592459}
}