Earthquake-like patterns of acoustic emission in crumpled plastic sheets R. S. Mendes, L. C. Malacarne, R. P. B. Santos, H. V. Ribeiro and S. Picoli jr. EPL, 92 2 (2010) 29001 Published online: 22 October 2010 DOI: 10.1209/0295-5075/92/29001