@TechReport{	  it:2004-019,
  author	= {Owe Axelsson and Maya Neytcheva},
  title		= {Eigenvalue Estimates for Preconditioned Saddle Point
		  Matrices},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Scientific Computing},
  year		= {2004},
  number	= {2004-019},
  month		= may,
  abstract	= {New eigenvalue bounds for symmetric matrices of saddle
		  point form are derived and applied for preconditioned
		  versions of the matrices. The preconditioners enable
		  efficient iterative solution of the corresponding linear
		  systems with, for some important applications, an optimal
		  order of computational complexity.}
}