@misc{indiciae76f87f3b862a,
  title = {Development and application of a spark source for multiply charged carbon ions},
  author = {Koopman, D. W. and Wilkerson, T. D. and Zwally, H. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700036631},
  note = {Source identifier: 19700036631}
}