@misc{indiciaedc9c426871c8,
  title = {Sequential stopping rules in clinical trials.},
  author = {K McPherson},
  year = {1990},
  doi = {10.1002/sim.4780090605},
  url = {https://pubmed.ncbi.nlm.nih.gov/2218163/},
  note = {Source identifier: 2218163}
}