%0 Journal Article
%A Omar Hirzallah
%A Fuad Kittaneh
%A Khalid Shebrawi
%T Numerical radius inequalities for $2\times  2$ operator matrices
%J Studia Mathematica
%D 2012
%P 99-115
%V 210
%N 2
%U http://geodesic.mathdoc.fr/articles/10.4064/sm210-2-1/
%R 10.4064/sm210-2-1
%G en
%F 10_4064_sm210_2_1