The numerical range of a normal operator
Berberian, S. K.
Duke Math. J., Tome 31 (1964) no. 1, p. 479-483 / Harvested from Project Euclid
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Publié le : 1964-09-14
Classification:  47.10 
@article{1077375362,
     author = {Berberian, S. K.},
     title = {The numerical range of a normal operator},
     journal = {Duke Math. J.},
     volume = {31},
     number = {1},
     year = {1964},
     pages = { 479-483},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1077375362}
}

Berberian, S. K. The numerical range of a normal operator. Duke Math. J., Tome 31 (1964) no. 1, pp.  479-483. http://gdmltest.u-ga.fr/item/1077375362/