Discrete Element Method studies of the collision of one rapid sphere on 2D and 3D packings L. Oger, M. Ammi, A. Valance and D. Beladjine Eur. Phys. J. E, 17 4 (2005) 467-476 Published online: 25 August 2005 DOI: 10.1140/epje/i2005-10022-x