@article{l. pirbudak2003ketoprof,
  title={Adding ketoprof en to intravenous patient-controlled analgesia with tramadol after major gynecological  cancer surgery: A double-blinded, randomized, placebo-controlled clinical trial},
  author={s. tuncer,l. pirbudak,o. balat,m. capar},
  journal={European Journal of Gynaecological Oncology},
  volume={24},
  number={2},
  pages={181--184},
  doi = {10.12892/ejgo200302181},
  year={2003}
}