TY  - JOUR
AU  - Jan Swoboda
AU  - Harald K. Wimmer
TI  - Spectraloid operator polynomials, the
 approximate numerical range and an
 Eneström–Kakeya theorem in Hilbert space
JO  - Studia Mathematica
PY  - 2010
SP  - 279
EP  - 300
VL  - 198
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm198-3-7/
DO  - 10.4064/sm198-3-7
LA  - en
ID  - 10_4064_sm198_3_7
ER  -