@misc{indiciae48e5fc7920e5,
  title = {Spectroscopy from 2 to 200 keV},
  author = {Helfand, D. J. and Chanan, G. A. and Novick, R. and Maccallum, C. J. and Leventhal, M.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19820018209},
  note = {Source identifier: 19820018209}
}