@TechReport{	  Zumbusch:1996*6,
  author	= {G. W. Zumbusch},
  title		= {Multigrid Methods for Finite Differences},
  institution	= {Sintef Applied Mathematics},
  year		= {1996},
  address	= {Oslo, Norway},
  ps		= {http://wissrech.ins.uni-bonn.de/research/pub/zumbusch/mgFdm.ps.gz}
		  ,
  pdf		= {http://wissrech.ins.uni-bonn.de/research/pub/zumbusch/mgFdm.pdf}
		  ,
  annote	= {unrefereed},
  abstract	= {The report serves as an alternative introductory report on
		  the multigrid iterative solvers in Diffpack using finite
		  differences instead of finite elements covered previously.
		  We consider the solution of elliptic partial differential
		  equations on different domains. We solve the resulting
		  linear equation systems with a multigrid iteration or a
		  Krylov iteration with a multigrid preconditioner. The
		  multigrid restriction and prolongation are also implemented
		  using finite ``difference'' type stencils. The first steps
		  are guided by a couple of examples and exercises.}
}