Short-time dynamics of a packing of polyhedral grains under horizontal vibrations E. Azéma, F. Radjaï, R. Peyroux, V. Richefeu and G. Saussine Eur. Phys. J. E, 26 3 (2008) 327-335 Published online: 06 June 2008 DOI: 10.1140/epje/i2007-10331-0