@article{NUMA_1992__63_1_133689,
     author = {Wolfgang Hackbusch},
     title = {The frequency decomposition multi-grid method. {II.} {Convergence} analysis based on the additive {Schwarz} method.},
     journal = {Numerische Mathematik},
     pages = {433--454},
     publisher = {mathdoc},
     volume = {63},
     number = {1},
     year = {1992},
     zbl = {0793.65089},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__63_1_133689/}
}