TY  - JOUR
AU  - Crabb, M. J.
TI  - Numerical range estimates for the norms of iterated operators
JO  - Glasgow mathematical journal
PY  - 1970
SP  - 85
EP  - 87
VL  - 11
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500000896/
DO  - 10.1017/S0017089500000896
ID  - 10_1017_S0017089500000896
ER  -