%0 Journal Article
%A Vladimír Müller
%T The joint essential numerical range, compact perturbations,
 and the Olsen problem
%J Studia Mathematica
%D 2010
%P 275-290
%V 197
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/sm197-3-5/
%R 10.4064/sm197-3-5
%G en
%F 10_4064_sm197_3_5