Intra-day variability observations of S5 0716+714 over 4.5 years at 4.8 GHz X. Liu, H.-G. Song, N. Marchili, B.-R. Liu, J. Liu, T. P. Krichbaum, L. Fuhrmann and J. A. Zensus A&A, 543 (2012) A78 Published online: 29 June 2012 DOI: 10.1051/0004-6361/201219367