@InCollection{	  Griebel.Harbrecht:2014,
  author	= {M.~Griebel and H.~Harbrecht},
  title		= {On the convergence of the combination technique},
  year		= {2014},
  booktitle	= {Sparse grids and Applications},
  series	= {Lecture Notes in Computational Science and Engineering},
  publisher	= {Springer},
  volume	= {97},
  pages		= {55--74},
  annote	= {series},
  inspreprintnum= {1304},
  note		= {Also available as INS Preprint No. 1304.},
  pdf		= {http://wissrech.ins.uni-bonn.de/research/pub/griebel/CombiTechniqueConvergence.pdf}
		  
}