@article{NUMA_1990__57_6-7_133432,
     author = {Gabriel Wittum},
     title = {On the {Convergence} of {Multi-Grid} {Methods} with {Transforming} {Smoothers.} {Theory} with {Applications} to the {Navier-Stokes} {Equations.}},
     journal = {Numerische Mathematik},
     pages = {15--38},
     publisher = {mathdoc},
     volume = {57},
     number = {6-7},
     year = {1990},
     zbl = {0698.65061},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133432/}
}