%0 Journal Article %A Greif, Chen %A Overton, Michael L. %T An analysis of low-rank modifications of preconditioners for saddle point systems %J Electronic transactions on numerical analysis %D 2010 %P 307-320 %V 37 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2010__37__a6/ %G en %F ETNA_2010__37__a6