Geodesic
Some remarks on the spectra and numerical range
Commentationes Mathematicae Universitatis Carolinae, Tome 9 (1968) no. 4, pp. 527-531 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Istrăţescu, V. Some remarks on the spectra and numerical range. Commentationes Mathematicae Universitatis Carolinae, Tome 9 (1968) no. 4, pp. 527-531. http://geodesic.mathdoc.fr/item/CMUC_1968_9_4_a2/

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