Added references.

README.md

@@ -17,3 +17,13 @@ the code is given in the third paper.
 S. Brdar, A. Dedner, and R. Klöfkorn.
 Compact and stable Discontinuous Galerkin methods for convection-diffusion problems.
 SIAM J. Sci. Comput., 34(1):263-282, 2012. http://dx.doi.org/10.1137/100817528
+
+A. Dedner and R. Klöfkorn. A Generic Stabilization Approach for Higher Order Discontinuous Galerkin Methods for Convection Dominated Problems.
+J. Sci. Comput., 47(3):365-388, 2011. http://dx.doi.org/10.1007/s10915-010-9448-0
+
+An overview on performance of the code is given in
+R. Klöfkorn. Efficient Matrix-Free Implementation of Discontinuous Galerkin Methods for Compressible Flow Problems.
+Proceedings of the ALGORITMY 2012. http://www.iam.fmph.uniba.sk/algoritmy2012/zbornik/2Kloefkornf.pdf
+
+By using the code you agree to cite one or both of the first two papers in any publication using this code.
+Figure: Solving the compressible Euler equations in 3D using the parallel-adaptive DUNE-ALUGrid and the DG discretization implemented in DUNE-FEM-DG.