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@article{NUMA_1962__4_131519, author = {F.L. Bauer}, title = {On the {Field} of {Values} {Subordinate} to a {Norm.}}, journal = {Numerische Mathematik}, pages = {103--113}, publisher = {mathdoc}, volume = {4}, year = {1962}, zbl = {0117.11004}, url = {http://geodesic.mathdoc.fr/item/NUMA_1962__4_131519/} }
F.L. Bauer. On the Field of Values Subordinate to a Norm.. Numerische Mathematik, Tome 4 (1962), pp. 103-113. http://geodesic.mathdoc.fr/item/NUMA_1962__4_131519/