@conference{5096,
  author = {Marek Sikora and Mitchell Begelman and M. Rees},
  title = {Comptonization of external radiation in blazars},
  year = {1993},
  journal = {AIP},
  publisher = {AIP},
  address = {St. Louis, MO, USA},
  url = {http://link.aip.org/link/APCPCS/v280/i1/p598/s1\&Agg=doi},
  doi = {10.1063/1.44292},
}