@misc{indiciae3316c6f3361d,
  title = {The interaction of X-ray sources with optically thin environments.},
  author = {Salpeter, E. E. and Tarter, C. B. and Tucker, W. H.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690056306},
  note = {Source identifier: 19690056306}
}