BeppoSAX and multiwavelength observations of BL Lacertae in 2000M. Ravasio, G. Tagliaferri, G. Ghisellini, F. Tavecchio, M. Böttcher and M. SikoraA&A, 408 2 (2003) 479-491DOI: https://doi.org/10.1051/0004-6361:20031015
