@article{NUMA_1991__59_8_133561,
     author = {K. Kunisch and G. Peichl},
     title = {Estimation of a temporally and spatially varying diffusion coefficinet in a parabolic system by an augmented {Lagrangian} technique.},
     journal = {Numerische Mathematik},
     pages = {473--510},
     publisher = {mathdoc},
     volume = {59},
     number = {8},
     year = {1991},
     zbl = {0742.65090},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__59_8_133561/}
}