@misc{indiciaef56c81003a40,
  title = {Medium Energy Hard X-ray FEL Gain},
  author = {Yu, Li Hua},
  year = {2020},
  doi = {10.2172/1668626},
  url = {https://www.osti.gov/biblio/1668626},
  note = {Source identifier: 1668626}
}