BeppoSAX and multiwavelength observations of BL Lacertae in 2000 M. Ravasio, G. Tagliaferri, G. Ghisellini, F. Tavecchio, M. Böttcher and M. Sikora A&A, 408 2 (2003) 479-491 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20031015