Stochastic dynamics of a sheared granular mediumA. Petri, A. Baldassarri, F. Dalton, G. Pontuale, L. Pietronero and S. ZapperiEur. Phys. J. B, 64 3-4 (2008) 531-535DOI: https://doi.org/10.1140/epjb/e2008-00177-x