Time reversal of ultrasound in granular media M. Harazi, Y. Yang, M. Fink, A. Tourin and X. Jia Eur. Phys. J. Special Topics, 226 7 (2017) 1487-1497 Published online: 25 May 2017 DOI: 10.1140/epjst/e2016-60259-1