@misc{indiciae25b57dbe7363,
  title = {Probability and sampling.},
  author = {J S Bulman and J F Osborn},
  year = {1989},
  doi = {10.1038/sj.bdj.4806749},
  url = {https://pubmed.ncbi.nlm.nih.gov/2920136/},
  note = {Source identifier: 2920136}
}