%0 Journal Article %A Ascher, U.M. %A Haber, E. %T A multigrid method for distributed parameter estimation problems %J Electronic transactions on numerical analysis %D 2003 %P 1-17 %V 15 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2003__15__a14/ %G en %F ETNA_2003__15__a14