@misc{indiciae240dcf5a7c97,
  title = {Photoelectron spectrometer with means for stabilizing sample surface potential},
  author = {Grunthaner, F. J. and Lewis, B. F.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780002486},
  note = {Source identifier: 19780002486}
}