TY  - JOUR
AU  - Mocanu, GH.
TI  - On the numerical radius of an element of a normed algebra
JO  - Glasgow mathematical journal
PY  - 1974
SP  - 90
EP  - 93
VL  - 15
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002214/
DO  - 10.1017/S0017089500002214
ID  - 10_1017_S0017089500002214
ER  -