@misc{pereira2009using,
  title={Using survival curves for comparison of ordinal qualitative data in clinical studies},
  author={B. de B. Pereira and E. M. Nascimento and F. Felix and G. F. M. Rezende},
  year={2009},
  eprint={0904.3915},
  archivePrefix={arXiv},
  primaryClass={stat.AP},
  url={https://arxiv.org/abs/0904.3915}
}