TY  - BOOK
AU  - Bonsall,F.F.
AU  - Bonsall,F.F.
AU  - Duncan,J.
TI  - Numerical ranges of operators on normed spaces and of elements of normed algebras
T2  - London Mathematical Society. Lecture note series,
SN  - 0521079888
PY  - 1971///
CY  - London
PB  - Cambridge University Press
N1  - Continued by the authors' Numerical ranges II
ER  -