TY  - JOUR
AU  - AKEMANN, CHARLES A.
AU  - ANDERSON, JOEL
TI  - THE SPECTRAL SCALE AND THE $k$–NUMERICAL RANGE
JO  - Glasgow mathematical journal
PY  - 2003
SP  - 225
EP  - 238
VL  - 45
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089503001320/
DO  - 10.1017/S0017089503001320
ID  - 10_1017_S0017089503001320
ER  -