@Article{	  Griebel.Oswald.Schiekofer:1999,
  author	= {M. Griebel and P. Oswald and T. Schiekofer},
  title		= {Sparse Grids for Boundary Integral Equations},
  journal	= {Numer. Mathematik},
  volume	= {83},
  number	= {2},
  year		= {1999},
  annote	= {article,CVD},
  ps		= {http://wissrech.ins.uni-bonn.de/research/pub/griebel/integralgl.ps.gz}
		  ,
  pages		= {279--312},
  note		= {also as SFB 256 report 554, Universit\"at Bonn}
}