@inbook{12413, author = {Kent-Andre Mardal and G. Zumbusch and Hans Langtangen}, title = {Multigrid Methods in Diffpack}, year = {2003}, journal = {Advanced Topics in Computational Partial Differential Equations - Numerical Methods and Diffpack Programming}, pages = {97-152}, publisher = {Springer}, editor = {Hans Langtangen and Aslak Tveito}, }