Low-frequency radio emission in the massive galaxy cluster MACS J0717.5 + 3745 M. Pandey-Pommier, J. Richard, F. Combes, K. S. Dwarakanath, B. Guiderdoni, C. Ferrari, S. Sirothia and D. Narasimha A&A, 557 (2013) A117 Published online: 17 September 2013 DOI: 10.1051/0004-6361/201321809