@misc{indiciaed7cbbdde3ea3,
  title = {Observations of the highly variable X-ray source GX 339-4.},
  author = {Markert, T. H. and Canizares, C. R. and Clark, G. W. and Lewin, W. H. G. and Schnopper, H. W. and Sprott, G. F.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730056965},
  note = {Source identifier: 19730056965}
}