Gustafson, K. E., & Rao, D. K. M. (1997). Numerical range: The field of values of linear operators and matrices. Springer.
Chicago Edition CitationGustafson, Karl E., and Duggirala K. M. Rao. Numerical Range: The Field of Values of Linear Operators and Matrices. New York: Springer, 1997.
MLA Edition CitationGustafson, Karl E., and Duggirala K. M. Rao. Numerical Range: The Field of Values of Linear Operators and Matrices. Springer, 1997.
Warning: These citations may not always be 100% accurate.