@misc{indiciae154e6ffed1b7,
  title = {Electrostatic free-electron laser.},
  author = {Sheng-gang Liu and Hong-xiu Liu},
  year = {1987},
  doi = {10.1103/physreva.36.3837},
  url = {https://pubmed.ncbi.nlm.nih.gov/9899319/},
  note = {Source identifier: 9899319}
}