%0 Journal Article
%A Istrăţescu, V.
%T Some remarks on the spectra and numerical range
%J Commentationes Mathematicae Universitatis Carolinae
%D 1968
%P 527-531
%V 09
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1968__9_4_a2/
%G en
%F CMUC_1968__9_4_a2