@misc{indiciaecc9bed0a94ba,
  title = {A high-sensitivity X-ray survey using the Einstein Observatory and the discrete source contribution to the extragalactic X-ray background},
  author = {Giacconi, R. and Bechtold, J. and Branduardi, G. and Forman, W. and Henry, J. P. and Jones, C. and Kellogg, E. and Van Der Laan, H. and Liller, W. and Marshall, H.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800053990},
  note = {Source identifier: 19800053990}
}