@misc{indiciae9eaa960c0255,
  title = {Low background gamma-ray spectrometer},
  author = {Gehrels, Neil and Candey, Robert M. and Matteson, James L.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910071980},
  note = {Source identifier: 19910071980}
}