@article{NUMA_1978__31_132584,
     author = {R. Beauwens},
     title = {Factorization {Iterative} {Methods,} {M-Operators} and {H-Operators.}},
     journal = {Numerische Mathematik},
     pages = {335--358},
     publisher = {mathdoc},
     volume = {31},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1978__31_132584/}
}