@article{8632,
  author = {M. Donahue and J. Shull},
  title = {Can quasars ionize the intergalactic medium?},
  year = {1987},
  journal = {The Astrophysical Journal},
  volume = {323},
  pages = {L13},
  month = {Jan-12-1987},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1987ApJ...323L..13D},
  doi = {10.1086/185048},
}