“…It has already been done for the homogeneous conservation law (q = 0) by R. Eymard, T. Gallouët, R. Herbin [10,11], [9] (with M. Ghilani) in the case where F (x, t, s) = v(x, t)f (s) and by B. Cockburn, F. Coquel, P. LeFloch [6,7], D. Kröner, M. Rokyta [12] and J.-P. Vila [24] in the case where F (x, t, s) = F (s). In a former paper [1], C. Chainais considered the homogeneous problem u t (x, t) + div(F (x, t, u(x, t))) = 0, x∈ R N , t ∈ R + , u(x, 0) = u 0 (x), x ∈ R N (2) under the hypothesis div x F = 0.…”