@misc{indiciaeff55aacae707,
  title = {Computer controlled operating and data handling system for a quadrupole mass spectrometer},
  author = {Hafner, F. W. and Houseman, J.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710052485},
  note = {Source identifier: 19710052485}
}