@misc{indiciae687346027ef9,
  title = {A simple algorithm for designing group sequential clinical trials.},
  author = {D A Schoenfeld},
  year = {2001},
  doi = {10.1111/j.0006-341x.2001.00972.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11550952/},
  note = {Source identifier: 11550952}
}