In this article we study the following quasi-linear parabolic problem: mu(t) - Deltau + \u\(beta-2) u\delu\(q) = \u\(alpha-2) \delu\(p) in Omega x ]0, T[, u(x, t) = 0 on phiOmega x]0, T[, u(x,0) = u(0)(x) in Omega, where Omega is a bounded open set of R-N and T > 0. We prove that if alpha, beta > 1, 0 less than or equal to p < q, 1 less than or equal to q less than or equal to 2, and alpha + p < beta + q, then there exists a generalized solution for all u(0) is an element of L-1 (Omega). (C) 2003 Elsevier Ltd. All rights reserved.