@misc{indiciae718925d9bc7c,
  title = {Sampling scheme.},
  author = {W A Nash},
  year = {1988},
  doi = {10.1136/vr.123.4.115-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/3046111/},
  note = {Source identifier: 3046111}
}