@article{rong zhou2020rare,
  title={A rare case of primary extrauterine endometrial stromal sarcoma involving the sigmoid colon},
  author={tingting cao,naze chen,huaxin sun,rong zhou,jianliu wang,xiuju yin},
  journal={European Journal of Gynaecological Oncology},
  volume={41},
  number={4},
  pages={661--663},
  doi = {DOI:10.31083/j.ejgo.2020.04.5191},
  year={2020}
}