@misc{indiciaebdec23b0c21e,
  title = {X-ray structure of the Cygnus Loop.},
  author = {Gorenstein, P. and Harris, B. and Gursky, H. and Giacconi, R. and Novick, R. and Vanden Bout, P.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720040033},
  note = {Source identifier: 19720040033}
}