Radio halos in nearby (z < 0.4) clusters of galaxiesG. Giovannini, A. Bonafede, L. Feretti, F. Govoni, M. Murgia, F. Ferrari and G. MontiA&A, 507 3 (2009) 1257-1270DOI: https://doi.org/10.1051/0004-6361/200912667