@misc{10139,
  author = {Are Bruaset and Hans Langtangen and G. Zumbusch},
  title = {Domain Decomposition and Multilevel Methods in Diffpack},
  year = {1997},
  journal = {Proceedings of the 9th Conference on Domain Decomposition},
  pages = {77-662},
  publisher = {Cambridge,},
  editor = {P. Bj{\o}rstad and M. Espedal and D. Keyes},
}