The discovery of diffuse steep spectrum sources in Abell 2256 R. J. van Weeren, H. T. Intema, J. B. R. Oonk, H. J. A. Röttgering and T. E. Clarke A&A, 508 3 (2009) 1269-1273 Published online: 21 October 2009 DOI: 10.1051/0004-6361/200912934