@Article{	  Griebel.Knapek:2008,
  author	= {M. Griebel and S. Knapek},
  title		= {Optimized General Sparse Grid Approximation Spaces for
		  Operator Equations},
  journal	= {Mathematics of Computations},
  year		= {2009},
  volume	= {78},
  number	= {268},
  month = {oct},
  pages		= {2223-2257},
  http_pdf	= {http://www.ams.org/mcom/2009-78-268/S0025-5718-09-02248-0/S0025-5718-09-02248-0.pdf}
		  ,
  note		= {Also available as SFB611 preprint No 402},
  pdf		= {http://wissrech.ins.uni-bonn.de/research/pub/griebel/griebel_sub_MComp.pdf}
		  ,
  ps		= {http://wissrech.ins.uni-bonn.de/research/pub/griebel/griebel_sub_MComp.ps.gz}
		  ,
  annote	= {article}
}