@misc{indiciae5c13e757ea73,
  title = {An ionized accretion disk in Cygnus X-1},
  author = {Done, C. and Mulchaey, J. S. and Mushotzky, R. F. and Arnaud, K. A.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930028527},
  note = {Source identifier: 19930028527}
}