@misc{indiciae20eb4c4a1f19,
  title = {X-ray timing explorer mission},
  author = {Bradt, H. V. and Rothschild, R. E. and Swank, J. H.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930044962},
  note = {Source identifier: 19930044962}
}