Some remarks on the spectra and numerical range
Commentationes Mathematicae Universitatis Carolinae, Tome 09 (1968) no. 4, pp. 527-531.

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Classification : 47-30, 47Axx
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Istrăţescu, V. Some remarks on the spectra and numerical range. Commentationes Mathematicae Universitatis Carolinae, Tome 09 (1968) no. 4, pp. 527-531. http://geodesic.mathdoc.fr/item/CMUC_1968__9_4_a2/