TY  - JOUR
AU  - R.H. jr. Martin
AU  - J.H. III. Lightbourne
TI  - Projection Seminorms and the Field of Values of Linear Operators.
JO  - Numerische Mathematik
PY  - 1975
SP  - 151
EP  - 162
VL  - 24
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/NUMA_1975__24_132335/
ID  - NUMA_1975__24_132335
ER  -