@misc{indiciae97034ac34c4a,
  title = {2-20 kev X-ray sky background},
  author = {Boldt, E. A. and Desai, U. D. and Holt, S. S. and Serlemitsos, P. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700038107},
  note = {Source identifier: 19700038107}
}