@misc{indiciae31d4804c7340,
  title = {Comparing sample size formulae for trials with unbalanced allocation using the logrank test.},
  author = {F Y Hsieh},
  year = {1992},
  doi = {10.1002/sim.4780110810},
  url = {https://pubmed.ncbi.nlm.nih.gov/1496196/},
  note = {Source identifier: 1496196}
}