@article{NUMA_1989__56_2-3_133418,
     author = {A. Hadjidimos and D.J. Pierce and ...},
     title = {Optimality {Relationships} for {p-Cyclic} {SOR.}},
     journal = {Numerische Mathematik},
     pages = {635--644},
     publisher = {mathdoc},
     volume = {56},
     number = {2-3},
     year = {1989},
     zbl = {0687.65034},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__56_2-3_133418/}
}