@misc{indiciaec0ac6d2be399,
  title = {New hard X-ray sources observed with HEAO A-2},
  author = {Marshall, F. E. and Boldt, E. A. and Holt, S. S. and Mushotzky, R. F. and Rothschild, R. E. and Serlemitsos, P. J. and Pravdo, S. H.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790063647},
  note = {Source identifier: 19790063647}
}