@misc{indiciaeb3ea01eb5f87,
  title = {X-ray structure of the Cygnus loop},
  author = {Rappaport, S. and Doxsey, R. and Solinger, A. and Borken, R.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19750032693},
  note = {Source identifier: 19750032693}
}