  For convection dominated problems, the streamline upwind Petrov--Galerkin
method (SUPG), also named streamline diffusion finite element method (SDFEM),
ensures a stable finite element solution. Based on robust a posteriori error
estimators, we propose an adaptive mesh-refining algorithm for SUPG and prove
that the generated SUPG solutions converge at asymptotically optimal rates
towards the exact solution.
