@article{NUMA_1982__39_132794,
     author = {A. Shapiro},
     title = {Optimally {Scaled} {Matrices,} {Necessary} and {Sufficient} {Conditions.}},
     journal = {Numerische Mathematik},
     pages = {239--246},
     publisher = {mathdoc},
     volume = {39},
     year = {1982},
     zbl = {0472.65038},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1982__39_132794/}
}