Mosaiced wide-field VLBI observations of the Lockman Hole/XMM E. Middelberg, A. T. Deller, R. P. Norris, S. Fotopoulou, M. Salvato, J. S. Morgan, W. Brisken, D. Lutz and E. Rovilos A&A, 551 (2013) A97 Published online: 04 March 2013 DOI: 10.1051/0004-6361/201220374