@misc{indiciae204502a945be,
  title = {Hollow-Cathode Source Generates Plasma},
  author = {Deininger, W. D. and Aston, G. and Pless, L. C.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890000403},
  note = {Source identifier: 19890000403}
}