@article{1213,
  author = {D. Guetta and G. Ghisellini and D. Lazzati and A. Celotti},
  title = {Internal shocks and the blazar sequence},
  year = {2004},
  journal = {Astronomy and Astrophysics},
  volume = {421},
  pages = {877-886},
  month = {Jan-07-2004},
  issn = {0004-6361},
  url = {http://www.edpsciences.org/10.1051/0004-6361:20040235},
  doi = {10.1051/0004-6361:20040235},
}