@misc{indiciae29a83179395d,
  title = {A note on P-values under group sequential testing and nonproportional hazards.},
  author = {Daniel L Gillen and Scott S Emerson},
  year = {2005},
  doi = {10.1111/j.1541-0420.2005.040342.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/16011703/},
  note = {Source identifier: 16011703}
}