@inbook{12552,
  author = {Kent-Andre Mardal and Joakim Sundnes and Hans Langtangen and Aslak Tveito},
  title = {Block Preconditioning and Systems of PDEs},
  year = {2003},
  journal = {Advanced Topics in Computational Partial Differential Equations - Numerical Methods and Diffpack Programming},
  pages = {199-236},
  publisher = {Springer},
  editor = {Hans Langtangen and Aslak Tveito},
}