@Article{	  Beuchler:2004,
  author	= {Beuchler, S.},
  title		= {Multilevel solvers for a finite element discretization of
		  a degenerate problem},
  journal	= {SIAM J. Numer. Anal.},
  fjournal	= {SIAM Journal on Numerical Analysis},
  volume	= {42},
  year		= {2004},
  number	= {3},
  pages		= {1342--1356}
}