Direct probes of dark matter in the cluster 1ES0657-556 through microwave observations S. Colafrancesco, P. de Bernardis, S. Masi, G. Polenta and P. Ullio A&A, 467 1 (2007) L1-L5 Published online: 27 February 2007 DOI: 10.1051/0004-6361:20066569