Extended emission around GPS radio sources C. Stanghellini, C. P. O'Dea, D. Dallacasa, P. Cassaro, S. A. Baum, R. Fanti and C. Fanti A&A, 443 3 (2005) 891-902 Published online: 15 November 2005 DOI: 10.1051/0004-6361:20042226