@article{105196, author = {Vasile Istr\u a\c tescu}, title = {Some remarks on the spectra and numerical range}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {009}, year = {1968}, pages = {527-531}, zbl = {0174.44304}, mrnumber = {0246147}, language = {en}, url = {http://dml.mathdoc.fr/item/105196} }
Istrăţescu, Vasile. Some remarks on the spectra and numerical range. Commentationes Mathematicae Universitatis Carolinae, Tome 009 (1968) pp. 527-531. http://gdmltest.u-ga.fr/item/105196/
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