@misc{indiciae94ccf0f7f1e1,
  title = {Stopping rules and estimation problems in clinical trials.},
  author = {M D Hughes and S J Pocock},
  year = {1988},
  doi = {10.1002/sim.4780071204},
  url = {https://pubmed.ncbi.nlm.nih.gov/3231947/},
  note = {Source identifier: 3231947}
}