Repeated segregation and energy dissipation in an axially segregated granular bed M. M. H. D. Arntz, W. K. den Otter, H. H. Beeftink, R. M. Boom and W. J. Briels EPL, 92 5 (2010) 54004 Published online: 05 January 2011 DOI: 10.1209/0295-5075/92/54004