The closure of the numerical range contains the spectrum.
Zarantonello, Eduardo H.
Pacific J. Math., Tome 23 (1967) no. 3, p. 575-595 / Harvested from Project Euclid
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Publié le : 1967-05-14
Classification:  47.30 
@article{1102992107,
     author = {Zarantonello, Eduardo H.},
     title = {The closure of the numerical range contains the spectrum.},
     journal = {Pacific J. Math.},
     volume = {23},
     number = {3},
     year = {1967},
     pages = { 575-595},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102992107}
}

Zarantonello, Eduardo H. The closure of the numerical range contains the spectrum.. Pacific J. Math., Tome 23 (1967) no. 3, pp.  575-595. http://gdmltest.u-ga.fr/item/1102992107/