Let Omega subset of R-N with N greater than or equal to 2. We consider the equations [GRAPHICS] with a(1) greater than or equal to a(2) greater than or equal to .... greater than or equal to a(N) greater than or equal to 0 and a(1) > a(N). We show that if Omega is a convex bounded region in R-N, there exists at least one classical solution to this boundary value problem. If the region is not convex, we show the existence of a weak solution. Partial results for the existence of classical solutions for non-convex domains in R-2 are also given.