@misc{indiciaed4d97a9033ea,
  title = {Cautionary note concerning the CuSO4 X-ray laser},
  author = {Billman, K. W. and Mark, H.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19740028151},
  note = {Source identifier: 19740028151}
}