@article{NUMA_1993__64_2_133715,
     author = {Harry Yserentant and F. Bornemann},
     title = {A basic norm equivalence for the theory of multilevel methods.},
     journal = {Numerische Mathematik},
     pages = {455--476},
     publisher = {mathdoc},
     volume = {64},
     number = {2},
     year = {1993},
     zbl = {0796.65135},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1993__64_2_133715/}
}