@misc{indiciae858f967caada,
  title = {Improved photoionization mass spectrometer},
  author = {Poshchenrieder, W. P. and Samson, J. A. R. and Warneck, P.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700000388},
  note = {Source identifier: 19700000388}
}