Stationary shear flows of dense granular materials: a tentative continuum modelling C. Josserand, P.-Y. Lagrée and D. Lhuillier Eur. Phys. J. E, 14 2 (2004) 127-135 Published online: 29 June 2004 DOI: 10.1140/epje/i2003-10141-4