Rotation measures of radio sources in hot galaxy clustersF. Govoni, K. Dolag, M. Murgia, L. Feretti, S. Schindler, G. Giovannini, W. Boschin, V. Vacca and A. BonafedeA&A, 522 (2010) A105DOI: https://doi.org/10.1051/0004-6361/200913665