@InProceedings{	  Griebel.Schneider.Zenger:1992,
  author	= { M.~Griebel and M.~Schneider and C.~Zenger},
  title		= {A combination technique for the solution of sparse grid
		  problems},
  editor	= {P. de Groen and R. Beauwens},
  booktitle	= { {Iterative Methods in Linear Algebra}},
  pages		= {263--281},
  publisher	= {IMACS, Elsevier, North Holland},
  year		= {1992},
  note		= {also as SFB Bericht, 342/19/90 A, Institut f\"{u}r
		  Informatik, TU M\"{u}nchen, 1990},
  annote	= {series},
  ps		= {http://wissrech.ins.uni-bonn.de/research/pub/griebel/griesiam.ps.gz}
		  
}