@article{608,
  author = {Christopher Reynolds and Phillip Armitage},
  title = {A Variable Efficiency for Thin-Disk Black Hole Accretion},
  year = {2001},
  journal = {The Astrophysical Journal},
  volume = {561},
  pages = {L81 - L84},
  month = {Jan-11-2001},
  issn = {0004637X},
  doi = {10.1086/324570},
}