TY  - JOUR
AU  - Vladimír Müller
TI  - The joint essential numerical range, compact perturbations,
 and the Olsen problem
JO  - Studia Mathematica
PY  - 2010
SP  - 275
EP  - 290
VL  - 197
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm197-3-5/
DO  - 10.4064/sm197-3-5
LA  - en
ID  - 10_4064_sm197_3_5
ER  -