@article{j. yu2011and,
  title={Prognosis and role of postmastectomy radiotherapy in patients with T1-T2 breast cancer with one to three positive axillary nodes},
  author={z. chen,j. hao,h. zhuang,j. yu},
  journal={European Journal of Gynaecological Oncology},
  volume={32},
  number={2},
  pages={141--145},
  doi = {10.12892/ejgo201102141},
  year={2011}
}