1. The asymptotic properties of solutions of the equation μ2Δu-k2(x,y)u=f(x,y) in a rectangle;Butuzov;Differential Equations,1973
2. A singularly perturbed elliptic equation with two small parameters;Butuzov;Differential Equations,1976
3. A robust method of improved order for convection–diffusion problems in a domain with characteristic boundaries;Clavero;Z. Angew. Math. Mech.,2002
4. Robust Computational Techniques for Boundary Layers;Farrell,2000
5. Theorie und Numerik elliptischer Differentialgleichungen;Hackbusch,1986