@article{l. sroka2008obstetric,
  title={Past obstetric history and risk of malignant breast neoplasms},
  author={b. pie˛ta,t. opala,m. wilczak,s. grodecka-gazdecka,l. kramer,d. samulak,k. wie˛znowska-ma˛czyn´ska,l. sroka},
  journal={European Journal of Gynaecological Oncology},
  volume={29},
  number={4},
  pages={374--377},
  doi = {10.12892/ejgo200804374},
  year={2008}
}