INTEGRAL discovery of non-thermal hard X-ray emission from the Ophiuchus clusterD. Eckert, N. Produit, S. Paltani, A. Neronov and T. J.-L. CourvoisierA&A, 479 1 (2008) 27-34DOI: https://doi.org/10.1051/0004-6361:20078853
