@article{NUMA_1990__57_6-7_133468,
     author = {W. Niethammer and M. Eiermann and ...},
     title = {Optimal {Successive} {Overrelaxation} {Iterative} {Methods} fo {P-Cyclic} {Matrices.}},
     journal = {Numerische Mathematik},
     pages = {593--606},
     publisher = {mathdoc},
     volume = {57},
     number = {6-7},
     year = {1990},
     zbl = {0708.65032},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133468/}
}