%0 Journal Article
%A Mocanu, GH.
%T On the numerical radius of an element of a normed algebra
%J Glasgow mathematical journal
%D 1974
%P 90-93
%V 15
%N 1
%U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002214/
%R 10.1017/S0017089500002214
%F 10_1017_S0017089500002214