@article{NUMA_1990__58_5_133491,
     author = {R. Plato and B. Eicke and A.K. Louis},
     title = {The instability of some gradient methods for ill-posed problems.},
     journal = {Numerische Mathematik},
     pages = {129--134},
     publisher = {mathdoc},
     volume = {58},
     number = {5},
     year = {1990},
     zbl = {0714.65056},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1990__58_5_133491/}
}