Stopping a Clinical Trial Very Early Based on Unplanned Interim Analysis: A Group Sequential Approach. Emerson, S. S. Biometrics, 51:1152-1162, 1995.
bibtex   
@article{eme95sto,
  title = {Stopping a Clinical Trial Very Early Based on Unplanned Interim Analysis: {{A}} Group Sequential Approach},
  volume = {51},
  journal = {Biometrics},
  author = {Emerson, Scott S.},
  year = {1995},
  keywords = {rct,study-design,monitoring,group-sequential-monitoring,unplanned-analysis,why-bayesian},
  pages = {1152-1162},
  citeulike-article-id = {13264046},
  posted-at = {2014-07-14 14:09:28},
  priority = {0}
}
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