@TechReport{	  Griebel.Zenger.Zimmer:1992,
  author	= {M. Griebel and C. Zenger and S. Zimmer},
  title		= {Improved multilevel algorithms for full and sparse grid
		  problems},
  type		= {{SFB-Report 342/15/92 A}},
  institution	= {Technische Universit\"at M\"unchen},
  annote	= {report},
  year		= {1992},
  ps		= {http://wissrech.ins.uni-bonn.de/research/pub/griebel/sfb15_92.ps.gz}
		  
}