@misc{indiciae0b037f65d36d,
  title = {Study and optimization of 15 cm Kaufman thruster discharges.},
  author = {Knauer, W. and Poeschel, R. L. and Ward, J. W.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690043889},
  note = {Source identifier: 19690043889}
}