@misc{indiciae2fbb8db662c5,
  title = {Two-twenty 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/19690020563},
  note = {Source identifier: 19690020563}
}