@misc{indiciaee94cd176c4a2,
  title = {Einstein Observations of the Cygnus Loop},
  author = {Ku, W. H.-M. and Kahn, S. M. and Pisarski, R. and Long, K. S.},
  year = {1984},
  url = {https://ntrs.nasa.gov/citations/19840046405},
  note = {Source identifier: 19840046405}
}