@misc{indiciae2a3a517a2b74,
  title = {Can quasars ionize the intergalactic medium?},
  author = {Donahue, Megan and Shull, J. Michael},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880033188},
  note = {Source identifier: 19880033188}
}