@Article{	  Beuchler.Nepomnyaschikh:2007,
  author	= {S. Beuchler and S. Nepomnyaschikh},
  title		= {Overlapping Additiv {S}chwarz preconditioners for
		  isotropic elliptic problems with degenerate coefficients},
  journal	= {J. Num. Math.},
  year		= {2007},
  optkey	= {},
  volume	= {15},
  number	= {4},
  pages		= {245--276},
  optmonth	= {},
  optnote	= {},
  optannote	= {}
}