@article{NUMA_1989__54_3_133332,
     author = {G. Wittum},
     title = {Mulit-Grid {Methods} for {Stokes} and {Navier-Stokes} {Equations.} {Transforming} {Smoothers:} {Algorithms} and {Numerical} {Results.}},
     journal = {Numerische Mathematik},
     pages = {543--564},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1989},
     zbl = {0645.76031},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__54_3_133332/}
}