Bonsall, F. F., & Duncan, J. (1971). Numerical ranges of operators on normed spaces and of elements of normed algebras. Cambridge University Press.
Chicago Edition CitationBonsall, F. F., and J. Duncan. Numerical Ranges of Operators on Normed Spaces and of Elements of Normed Algebras. London: Cambridge University Press, 1971.
MLA Edition CitationBonsall, F. F., and J. Duncan. Numerical Ranges of Operators on Normed Spaces and of Elements of Normed Algebras. Cambridge University Press, 1971.
Warning: These citations may not always be 100% accurate.