The intra-night optical variability of the bright BL Lacertae object S5 0716+714 F. Montagni, A. Maselli, E. Massaro, R. Nesci, S. Sclavi and M. Maesano A&A, 451 2 (2006) 435-442 Published online: 02 May 2006 DOI: 10.1051/0004-6361:20053874