MathSciNet bibliographic data MR2170523 (2007b:65113) 65N22 (76M10 76R50 76S05) Powell, Catherine E. Parameter-free $H({\rm div})$$H({\rm div})$ preconditioning for a mixed finite element formulation of diffusion problems. IMA J. Numer. Anal. 25 (2005), no. 4, 783–796. Article

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