Comparing Sample Size Formulae for Trials with Unbalanced Allocation Using the Logrank Test. Hsieh, F. Y. Stat Med, 11:1091-1098, 1992.
bibtex   
@article{hsi92com,
  title = {Comparing Sample Size Formulae for Trials with Unbalanced Allocation Using the Logrank Test},
  volume = {11},
  journal = {Stat Med},
  author = {Hsieh, F. Y.},
  year = {1992},
  pages = {1091-1098},
  citeulike-article-id = {13264337},
  posted-at = {2014-07-14 14:09:33},
  priority = {0}
}

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