@misc{indiciae5edd09b9ea84,
  title = {Ion thruster diagnostics using spectral line amplitudes},
  author = {Milder, N. L. and Sovey, J. S.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720006091},
  note = {Source identifier: 19720006091}
}