%0 Journal Article
%A Chi-Kwong Li
%A Yiu-Tung Poon
%T The joint essential numerical range of operators:
convexity and related results
%J Studia Mathematica
%D 2009
%P 91-104
%V 194
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4064/sm194-1-6/
%R 10.4064/sm194-1-6
%G en
%F 10_4064_sm194_1_6