Back and forth from cool core to non-cool core: clues from radio halos M. Rossetti, D. Eckert, B. M. Cavalleri, S. Molendi, F. Gastaldello and S. Ghizzardi A&A, 532 (2011) A123 Published online: 04 August 2011 DOI: 10.1051/0004-6361/201117306