%0 Journal Article
%A Jan Swoboda
%A Harald K. Wimmer
%T Spectraloid operator polynomials, the
 approximate numerical range and an
 Eneström–Kakeya theorem in Hilbert space
%J Studia Mathematica
%D 2010
%P 279-300
%V 198
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/sm198-3-7/
%R 10.4064/sm198-3-7
%G en
%F 10_4064_sm198_3_7