@article{GDZPPN001164082, title = {On the Field of Values Subordinate to a Norm.}, journal = {Numerische Mathematik}, volume = {4}, year = {1962}, pages = {103-113}, zbl = {0117.11004}, url = {http://dml.mathdoc.fr/item/GDZPPN001164082} }
Bauer, F.L. On the Field of Values Subordinate to a Norm.. Numerische Mathematik, Tome 4 (1962) pp. 103-113. http://gdmltest.u-ga.fr/item/GDZPPN001164082/