@misc{indiciae9847c2841c8a,
  title = {X-ray echoes from gamma-ray bursts},
  author = {Dermer, Charles D. and Hurley, Kevin C. and Hartmann, Dieter H.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910042459},
  note = {Source identifier: 19910042459}
}