@article{NUMA_1983__41_132846,
     author = {W. Niethammer and R.S. Varga},
     title = {The {Analysis} of {k-Step} {Iterative} {Methods} for {Linear} {Systems} from {Summability} {Theory}},
     journal = {Numerische Mathematik},
     pages = {177--206},
     publisher = {mathdoc},
     volume = {41},
     year = {1983},
     zbl = {0487.65018},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1983__41_132846/}
}