@article{ETNA_2010__37__a6,
     author = {Greif, Chen and Overton, Michael L.},
     title = {An analysis of low-rank modifications of preconditioners for saddle point systems},
     journal = {Electronic transactions on numerical analysis},
     pages = {307--320},
     publisher = {mathdoc},
     volume = {37},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2010__37__a6/}
}