@misc{indiciae2c59fef706da,
  title = {Maximum propellant utilization in an electron-bombardment thruster},
  author = {Kaufman, H. R. and Cohen, A. J.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710026637},
  note = {Source identifier: 19710026637}
}