@article{NUMA_1980__35_186277,
     author = {R.S. Varga and M. Neumann},
     title = {On the {Sharpness} of {Some} {Upper} {Bounds} for the {Spectral} {Radii} of {S.O.R.} {Iteration} {Matrices.}},
     journal = {Numerische Mathematik},
     pages = {69--80},
     publisher = {mathdoc},
     volume = {35},
     year = {1980},
     zbl = {0453.65021},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1980__35_186277/}
}