TY  - BOOK
AU  - Gustafson Karl E
AU  -  Rao Duggirala K M
TI  - Numerical range: the field of values of linear operators and matrices
T2  - Universitext
SN  - 038794835X (New York:pbk)
U1  - B48, N7 
PY  - 1997///
CY  - New York Springer-Verlag, Inc
KW  -  Operational calculus
KW  - Mathematics
N1  - Bibliography 171-185p; Index 187-189p
ER  -