@Article{	  Bungartz.Griebel.Rude:1994,
  author	= {H.-J. Bungartz and M. Griebel and U. R\"ude},
  title		= {Extrapolation, combination, and sparse grid techniques for
		  elliptic boundary value problems},
  journal	= {Comput. Methods Appl. Mech. Eng.},
  volume	= {116},
  pages		= {243--252},
  annote	= {article},
  note		= {Auch in C.~Bernardi and Y.~Maday, Editoren, {
		  International conference on spectral and high order
		  methods, {ICOSAHOM 92}}. Elsevier, 1992, und als SFB
		  Bericht, 342/10/92 A, Institut f\"ur Informatik, TU
		  M\"unchen, 1992},
  year		= {1994},
  ps		= {http://wissrech.ins.uni-bonn.de/research/pub/griebel/sfb10_92.ps.gz}
		  
}