@Article{	  Griebel.Zenger.Zimmer:1993,
  author	= {M. Griebel and C. Zenger and S. Zimmer},
  title		= {Multilevel {G}au{\ss}--{S}eidel--algorithms for full and
		  sparse grid problems},
  journal	= {Computing},
  volume	= {50},
  pages		= {127--148},
  annote	= {article},
  year		= {1993}
}