Radio structure of the blazar 1156 + 295 with sub-pc resolution W. Zhao, X.-Y. Hong, T. An, D.-R. Jiang, J.-H. Zhao, L. I. Gurvits and J. Yang A&A, 529 (2011) A113 Published online: 14 April 2011 DOI: 10.1051/0004-6361/201016192