@article{y. li2016yolk,
  title={Ovarian yolk sac tumor in postmenopausal females: a report of five cases and a literature review},
  author={x. wang,j. he,y. li},
  journal={European Journal of Gynaecological Oncology},
  volume={37},
  number={3},
  pages={374--379},
  doi = {10.12892/ejgo2803.2016},
  year={2016}
}