@article{7692,
  author = {P. Guilbert and A. Fabian and M. Rees},
  title = {Spectral and variability constraints on compact sources},
  year = {1983},
  journal = {Monthly Notices of the Royal Astronomical Society},
  volume = {205},
  pages = {593-603},
  url = {http://adsabs.harvard.edu/full/1983MNRAS.205..593G},
  note = {JILA Pub. 2732},
}