@misc{indiciae4b25771d318c,
  title = {X-ray spectral data from GX3 plus 1.},
  author = {Giacconi, R. and Gorenstein, P. and Gursky, H.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690060183},
  note = {Source identifier: 19690060183}
}