Full analysis of the Green's function for a singularly perturbed   convection-diffusion problem in three dimensions
  A linear singularly perturbed convection-diffusion problem with characteristic layers is considered in three dimensions. Sharp bounds for the associated Green's function and its derivatives are established in the $L_1$ norm. The dependence of these bounds on the small perturbation parameter is shown explicitly. The obtained estimates will be used in a forthcoming numerical analysis of the considered problem.   The present article is a more detailed version of our recent paper [7]. 
S. Franz and N. Kopteva
math.NA math.AP