1. Topics in Matrix Analysis;Horn,1994
2. Numerical Range: The Field of Values of Linear Operators and Matrices;Gustafson,1997
3. T. Ando, C.K. Li (Eds.), The Numerical Range and Numerical Radius, Linear and Multilinear Algebra 37 (1–3) (Special issue).
4. C-Numerical ranges and c-numerical radii;Li;Linear and Multilinear Algebra,1994
5. Research problems on numerical ranges in quantum computing;Kribs;Linear and Multilinear Algebra,2009