@misc{indiciaeb9444b0aa594,
  title = {A cold cathode ion source mass spectrometer employing ion counting techniques},
  author = {Blum, P. and Fowler, P. and Roehrig, J. R. and Torney, F. L., Jr.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700006488},
  note = {Source identifier: 19700006488}
}