Verbessere Text zur Mehrgitterkonvergenz

skript-mehrgitter-sander.bib

@@ -114,3 +114,17 @@ year = {2013}
  year = {2009},
  pages = {1--44}
 }
+
+@article{arnold1997preconditioning,
+  title={{Preconditioning in $H$(div) and applications}},
+  author={Arnold, D. N. and Falk, R. S. and Winther, R.},
+  journal={Mathematics of computation},
+  year={1997}
+}
+
+@article{arnold2000multigrid,
+  title={{Multigrid in $H$(div) and $H$(curl)}},
+  author={Arnold, D. N. and Falk, R. S. and Winther, R.},
+  journal={Numerische Mathematik},
+  year={2000}
+}