@article{ETNA_2003__15__a14,
     author = {Ascher,  U.M. and Haber,  E.},
     title = {A multigrid method for distributed parameter estimation problems},
     journal = {Electronic transactions on numerical analysis},
     pages = {1--17},
     year = {2003},
     volume = {15},
     zbl = {1031.65108},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2003__15__a14/}
}