@misc{indiciae7e3537dbf1d8,
  title = {Implementation of group sequential logrank tests in a maximum duration trial.},
  author = {K K Lan and J M Lachin},
  year = {1990},
  url = {https://pubmed.ncbi.nlm.nih.gov/2242413/},
  note = {Source identifier: 2242413}
}