@misc{indiciae363465ea919a,
  title = {Ion extractor system design.},
  author = {Gula, W. P. and Richley, E. A. and Staggs, J. F.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670040148},
  note = {Source identifier: 19670040148}
}