@article{NUMA_1990__57_6-7_133437,
     author = {Michael Neumann and Martin Hanke},
     title = {Preconditionings and {Splittings} for {Rectangular} {Systems.}},
     journal = {Numerische Mathematik},
     pages = {85--96},
     publisher = {mathdoc},
     volume = {57},
     number = {6-7},
     year = {1990},
     zbl = {0704.65018},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133437/}
}