Two-year monitoring of intra-day variability of quasar 1156+295 at 4.8 GHz B.-R. Liu, X. Liu, N. Marchili, J. Liu, L.-G. Mi, T. P. Krichbaum, L. Fuhrmann and J. A. Zensus A&A, 555 (2013) A134 Published online: 12 July 2013 DOI: 10.1051/0004-6361/201220850