@article{a. altmtas2001nervous,
  title={Central nervous system involvement in gestational trophoblastic neoplasia},
  author={a. altmtas,m. a. vardar},
  journal={European Journal of Gynaecological Oncology},
  volume={22},
  number={2},
  pages={154--156},
  doi = {10.12892/ejgo200102154},
  year={2001}
}